Why do I have sense of TASTE???

Telling the difference between tastes,was Crucial to our prehistoric survival. Bitter flavours, for instance, may have a signaled a poisonous plant. Sour taste indicates a spoiled supper. Sweet, savory, and fatty flavors were tied to food with a lot of energy.


How do I taste my food???
Your tongue bristles with many tiny bumps called taste buds: chemical receptors that interpret flavours and transmit that information to your noggin. Our sense of smell also greatly enhanced the flavor of out food.


Why do my arms or legs get tingly when I lie on the. ???
Roll onto your arm in your sleep and you will likely wake up to find it numbs and lifeless, as if it wants to sleep in. Then comes the sensation of pins and needles.contrary to what you might think, limbs don't go limps simply because you cut off their blood supply when you lie on them wrong. Instead you are pressing on nerves and cutting off the limbs communication with the brain. Roll off and the nerves go through a sort of "reboot", sending pulses to the brain that you are perceive as that tingly feeling. The lazy limb comes back online in short order.



Why do I start sneezing when I step into sunlight???
You must have a "photic sneeze reflex" a condition that causes you to sneeze uncontrollably when suddenly exposed to bright light. About on in five people have it, although aren't sure why?? ?




Why does I get light headed when I stand up too fast.????
Doctors have a name for that fuzzy feeling in your head when you leap to your feet from a sitting position : orthostatic hypotension.  When you stand up quickly, gravity causes blood to settle in the lower parts of your legs and lower torso
Your body tries to equalize blood pressure to our upper torso, arms and head, which results in a sudden drop in blood pressures and a few seconds of feeling faint. It's normal for us.


Why does my to tongue has flavor-sensing zones? ???
People used to think that different clusters of taste buds around  your tongue were turned into different flavors, but recent studies debunked this" taste and map" with only slight variation. Every taste bud on your tongue is capable of sensing all the flavors. The center your tongue meanwhile is a tasteless place, free of taste buds. 

Why do I have fingernails???

Researchers think that fingernails and toenails helped our ancestors climb trees, peel fruit, and use simple tools. And fingernails are still useful today! Their color and conditions offer clues about your overall health. Nails polish turns them into fashion accessories. You use them to pop open tops of soda cans. And nothing makes a better back-sctratcher than a nice set of nails!


Do animals have fingerprints like us?? ? ?
It should come as no surprise that gorilla, chimpanzee ,and other higher primates closet related to humans have fingerprints. But if you look closely at a koala's paws. You will see tiny swirling ridges on the skin of its fingers and toes. They are fingerprints and every koala has a unique set. That means animals detectives would have no problem tracking down koala crooks!!


What would happen if I never trimmed my nails. ??
Fingernails grows slowly roughly a hairs width a day, but that growth adds up over the long term. Let yours grow wild and you might eventually beat the Guinness world record set by Melvin Boothe, whose untamed claws reached a combined length of more than 32ft. Approx 10 meters.



Note: your tongue is IMPRINTED with pattern just like your fingerprints. 

Why do I have 10 figures???

Scientists says many ideas behind that. One theory suggest that four fingers and one thumb on each hand are the perfect number and length to grip object firmly. (another study suggests we can grasp most thing with just our thumb and index finger is necessary: the other four fingers are spares.)
The process of evolution determined the most beneficial number of fingers and toes for our survival. Pandas, after all have thumblike digits to help than grasps bamboo shoots, while some birds have quadruple digits for perching and tucking away during flight. Occasionally, babies are born with extra fingers and toes (condition known as polydactyly), but those additional digits have never offered enough of an edge to survive to later generations. In other words, evolution determined that five fingers per hand just right for us.


Why do I have thumbs?
Having no thumbs would make you all thumbs, fumbling to tie your shoes or assemble a hamburger. We inherited a fully "opposable" thumbs named for his ability to close tip to tip against our other fingers --from our primate ancestors around two million years ago. These ancient relatives needed handier hand to help get a grip on simple tools. So give a thumbs-up to your thumbs. Thay are the main reason you can text with one hand and build a burger without fumbling the bun.


Do other animals have thumbs besides us???
Lots of them, although the exact numbers depend on your definition of "thumbs " Apes and many monkeys have opposable thumbs just like us, while smaller primates, pandas, and koalas have thumblike digits and claws that help them grip plants and prey.

Why do I have fingerprints ?????
Those whirls, swirls, loops, and arches on your fingertips (and toes, in case you didn't know) are unique to you. Even if have identical twim-and they remained unchanged throughout entire life. In fact, the fact ridges known as fingerprints from before even you are born. Fluids in the womb put pressure on your developing  digits, which, combined with your rate of growth and genetic makeup, create one-of-a-kind designs.


Why do my fingers wrinkle when I have been swimming?? ?
You might think that playing in the pool or soaking in the tub makes your fingertips and toes waterlogged and soggy. Not so, the prune effect is caused by blood vessels shrinking just below the skin -- an automatic reaction triggered by your nervous system when it senses long exposure to water. Scientists think people evolved this reaction to improve their grip and traction in wet enviorments. After all, print fingers make it easier to sang slippery fish.


Why can I pop my KNUCKLES????
When you move or bend your fingers, you occasionally squeeze tiny air bubbles that from in the protective fluid around your body's joint. Those popping bubbles create an audible crack. 

Why are my tears salty???

The most common type of salt -- is in all your body's fluids: blood, sweat, and tears. Your Tears contains a little less than one percent salt.

Why do my eyes sting when I swim in the ocean but not when I cry???
Because sweater contains about three times more salt than your tears. The higher concentration of salt can cause a mild stinging in eyes even if you wear a mask.

Why do I cry????
That depends on the kind of crying you are talking about. Our eyes produce tears of three types.
1. Basal tears: flow constantly to keep our eyes from drying out. Our bodies produce about five to ten ounces ( 148-295ml) of basal tears each day.
2. Reflex tears: protect our peepers from irritants in the air, such as smoke and dust.
3. Emotional tears: flow when our brain register sadness and stress, which triggers the release of body chemicals called hormones that turn on the waterworks. Some scientists believe that build up during stress-- which is why you feel better after "having good cry". With the possible exceptions of elephants and gorillas, human are the only animals that she tears of this type.


Why do I blink? ??
Humans blink automatically to flush away the stream of cleansing tears produced by ducts in the corners of our eyes. Adults blink about 15 times per minute, but our rate of blinking slow when we read(which is why our eyes tiers after tracking a long book) or focus on a distant object. No matter how hard we try not a blink, the need of flush the eyes eventually trumps our will power -- as anyone who's is lost a staring contest will tell you.


Why do some people need to wear glasses or contacts???
Your eyes are amazing machine, but it take only one small imperfection in the shape of your cornea or the lease to cause fuzzy focusing. Doctors call these imperfections astigmatism, and they are often inherited from parents. Glasses and contact lenses(or corrective surgery) can fix the problem.

Note: Infants blank only about two times per minute.

Why are my eyes Green or brown or black or etc....

Just like the shape of your nose and the color of your hair and eye. Color is determined by the Genes you inherit from your parents. Those genes determined how much melanin-- a colored chemical matter -- you have in each IRIS, which is the colorful part of the eye. The more melanin you have, the darker your eyes. Less melanin makes for lighter eyes, which is why fair-skinned people often have light blue or gray eyes.


Why do I see in 3-D????
Like all human beings, you have binocular vision, both your eyes face toward the front and provide your brain with two slightly offset images. Your brain processes the differences in these two images to create a perception of depth, or a three-Dimensional view.


Parts of eyes and functions.

Iris: IRIS, which is the colorful part of the eye. The more melanin you have, the darker your eyes. Less melanin makes for lighter eyes, which is why fair-skinned people often have light blue or gray eyes.

Cornea: the eyes protective, transparent cover, the Corena is similar to the protective glass on a camera lens. It bends that light entering your eye to pre-focus the image before it reaches your lens. 

Pupil: muscles in the iris control this hole in the center, which like a camera shutter, allows light to enter the eye and strike the lens. In bright sunlight, the pupil contracts to let in less light. In darkness, it open wide to let in as much light as possible.

Sclera: the white of our eyes, Sclera from a protective cover about the size of ping-pong ball.

Lens: like a projector in a movie theater, the lens focuses light on to the retina. It's suspended in a muscle that change the shape of the lens on focus on object near and far faster than any computerized camera.

Optic nerve : This cable carries visual information from your ratina to the brain. Your brain processes the information and translate it into what you are actually seeing.

Retina:


Why do I have eyelashes ????
These fine hair are our eyes first line of defense, shielding them from dust and dirt.

Why do we dream????

Scientists says that dreams help us cope with painful memories. Dreamimg might also make us smarter and more creative  during our waking hour. So if you are feeling drained, grabbing 40 winks -- and a few vivid dreams -- might recharge your brain.


Why do some people snore in their sleep???
Because something is keeping the air from moving freely through the passage behind their nose and mouth. May be they have bad sleep posture, or maybe they have put on weigh or have a sinus infection. Sometimes snoring is brought on by age. Whatever the reason, snoring can get loud. A woman in England once snored loud enough drown out the sound of law-flying passenger plane!


Can we control our dreams?? ?
Sleep experts says we can seize control of  our dreams and do all sorts of fantastical things ---- fly, relive favourite memories, eat a mountain of ice cream -- but only after we realized we are actually dreaming. Achieving this deep-sleep state, known as lucid dreaming, isn't easy. Wannable dream masters practice every night for years and still never achieve success. A variety of masks and headbands promise to help sleepers reach a lucid state by flashing tiny lights above the eyelids. Sleep researchers, meanwhile, are researching other methods of triggering dreams.


How long do I need to sleep before I start to dream??? ?
Dreams don't start until you reach a state called REM (Rapid eye movement ) sleep, roughly 90 minute after your head hits the pillow.

Why do we yawn????

Everybody yawns -- Even unborn babies in the womb -- and yet researchers aren't quite sure why we do it. -- Although humans yawn more often when we're tired or bored, scientists have ruled out sleepiness or lack of oxygen(which would cause sleepiness) as causes. Instead, they suspected yawing might help us keep a cool head. As with a supercomputer, the brain needs to stay cool to function properly. Each yawn pumps air into sinus cavities in the head, cooling the brain in the process. And because the brain and body are slightly warmer just before bed, we tend to yawn when we're tired.


WHY do we need to SLEEP???
Video games, track meets, chemistry class -- your waking hours are crammed with activities and tasks that give your noggin a real workout. All that processing causes chemicals to clutter  your brain. A good nights sleep cleaned your head -- literally. While you snooze, your brain goes into housekeeping mode, flushing the toxins and preparing itself for a busy day of math classes, socializing, and beating your brother in basketball.


How much sleep do I need???
That depends on your age, kids between 5 and 12 need about 11 hours of sleep. Older kids and adults can get by with 7 or 8 hours.


Why is Yawning contagious????
Yawns don't catch on among children younger than five or among people with emotionally dampening disorders. That leads researchers to believe contagious yawning Is just another way humans reinforce social bonds between people, humans are social and emotional animals. We tend to understand and feel the emotions of friends and even strangers. Yawning falls into that category, when we see someone, we yawn.


Is Yawning contagious for other  animals besides humans????
You bet, at least among higher parameters such as chimpanzees and bonobos (for the same reason as for humans, researchers suspect). Even more surprising show  that dogs catch yawns from watching people!!


What happens if I don't get enough sleep???
Doctors believe that a good night's sleep come with many benefits, including improve creativity and mental sharpness. Avoid going to bed and you will soon suffer the consequences crankiness, clumsiness --- even hallucinations if you miss a few days. Your brain will go on strike,  and easy tasks will become supremely difficult until you turn in and switch off.


Why do I get sleepy? ??
Whenever you try to defeat drowsiness to finish one more Harry Potter chapter, you are actually locked in a losing battle over bedtime with your brain stem. This chunk of gray matter at the base of your brain regulates your sleep, along with other automatic bodily functions such as breathing and the ticking of your heart..



Q. How can we get a Good night SLEEP ??
A.
 1. Meet to sleep schedule. Set a bedtime and a wake up time and stick to them.
2. Relax with a book before bed, but don't keep your smartphone within reach. It's a certified sleep stopper.
3. Don't fall a sleep with a television on.
4. Don't eat any big meals or chugany large drinks within two hours of sleep.
5. Getting plenty of sun exposure during the day helps you sleep at night ,so spend some waking hours outside! !

Why am I smarter than dolphin or chimpanzee?????

Credit for your uniquely human intellrct-your ability to  slice algebra problems or play the electric guitar or wonder about the function of your own brain-goes to your cerebrum. Accounting for 85percent of your brain mass, it's far larger and more complex than the cerebrum of other brainy animals such as dolphins, whales, and elephants .It's also home to your brains most important lobes--the sub processor of that supercomputer between your ears .


Why does my body move when I want it to?
Your cerebellum the second largest part of your brain, coordinates the movement of your muscles and keeps you from tumbling over when you walk.


Why do I remember things???
Every time you experience something new, electrical charges fire through the white matter in your brain, creating chemicals links that form a network of pathways out of  neurons. Your memories are stored in these connected neurons, and the connections becomes stronger and expand into other neurons with repeated exposure to the new experience .Practicing a new song on the guitar makes the same neural network fire again and again, becoming stronger and thus making the song easier to play .Spending time with a new friend reinforce old connections and builds new ones as you learn about your pal's habits, As you learn and gained new memories your brain's structure changes and makes new connections. The brain you have today will be different tomorrow.


Why do I forgot things???
When it comes to retaining memories, your brain is practically a bottomless pit-- one that continues to deepen throughout your life. So why did you forget where you put your towel at swim practice? It turns out your brain is equipped with two types of memory....
Short term: powerful but fleeting short term memory is meant to store informations --- such as phone number, email and other humdrum everyday data like the location of that towel at swim practice--- that you won't need to recall during your golden years. As you would expect , short term memories don't linger. They fed even faster if you were distracted at the time the money took shape (maybe a teammate was talking to you while put down your towel, or maybe you moved the towel many times during practice and your shoe term memory can't place it's exact location).
Long term: Experience move from short term to long term memory when they are repeated(such as when you memorize flash cards to study for a test)  or accompanied by meaningful emotions and significant sensory input (such as when you scorred the winning goal or the day you got your pooch as a puppy). Scientists believe your brain has a limitless capacity for long-term memories, but sometimes you can't recall a particular detail without help from from sensory clues ( a Familier smell is a powerful reminder) or the recollection of friends involved in the event. Scientists blame such forgotfulness on a flaw in our ability to retrieve memories -- a flaw that nonscientists call a "brain fart".

Why we ask Questions WHY??

Thanks that amazing brain of yours for your uncontrolled curiosity. Not only does this wrinkly mess of grey matter control all your body's automatic functions (breathing, blinking, food processing, the breathing of your heart), but it also empowers you to laugh, cry, create, dream, score a three-pointer in basketball, learn, paint, beat you sister at Mario Kart and ask questions. The brain is the master of your nervous system and the source of your personality. No other organ in nature is as mysterious.

What exactly is between my ears, anyway?
One of our body's largest organ, your brain is  three pounds (1.3 kg)  of fat and proteins condensed in amass with a tofu-like textures. Its contents come in two colors.
1. Gray matter :  your brain contains about 100 billion nerve cells. Called neurons, they make up your brain's "gray matter".
2. White matter : your nervous communicate with one another by sending electrical signal and formatting chemical connections in a network of nerve fibres called dendrites and axons, which form your brains white matter. This communication between neurons is what is responsible for your every thought, memory, movement and automatic bodily function.

How much of my body's energy does my brain use??
The electrical messages bouncing across your at any given time outnumber the messages zipping through the world's telecommunications networks.All that activity requires enough electricity to power a dim tube light, that might not sound like much until you consider the brain uses 20 percent of the body's energy but is only about 2 percent of its weight.


What protects my brain from injury? ??
Our brains is a delicate organ that needs all the protection it can get. That thick skull of yours is it's first line of defense (being boneheaded is a good thing!)  followed by three sturdy membrane called meninges. Fluid fill the gaps between these membranes, cushioning the brain from impacts. A special "blood-brain barrier" made of special cells acts like a security perimeter in the brains circulatory system, and keeps out anything that might contaminate your sensitive network of neurons.

Whenever you get in trouble for doing something totally lame brained blame your lame brain. It hasn't finished developmenting yet. Scientists discovered that the white matter connecting your frontal lobe---which control your decision  making process to the rest of the brain isn't fully formed until you reach yourid 20s .In other words, your center of good judgement isn't fully wired into your brain yet .


Why we use only 10 percent of our brains ??
It's a reasoning idea for everyone who thinks they have superpowers or hidden artists talents: we would accomplish amazing facts if we could just tap into our unused reserved of gray matter. It's also a total myth. We use nearly every parts of our brain all the time. Even a simple activity like brushing your teeth, walking toward the toothbrush .Squeezing out just enough toothpaste, keeping track of which teeth you have cleaned as you brush away -activates a small electrical storm across your brain as the various lobes, cortices, and cerebellum work together to brush, rinse, split, and remember to floss, the activity in your brain never stops, even when you sleep.


Q. How can I protect my BRAIN??
A. To wear a helmet, without smoking, to eat well, to exercise our body, to exercise with mind.

Why can I survive without all my organs??

It's no-brainer that you need your brain and your heart, and you wouldn't last long if your liver failed.But. the lungs and kidneys come in pairs, so you could survive if one of then failed. people who have lost their spleens in accidents have gone on to live healthy lives. The tonsils and appendix, meanwhile and practically useless and rare routinely removed when they become inflamed.

Why do I have eyebrows???

Humans have evolved to become less hairy in the past six million years or so, but we still have those clumps of fur above eyes. Beyond their role in our facial expressions, eyebrows act like natural sweatbands, preventing rain and sweat from running directly into our eyes. 

Why are some body parts pointless? ?

Called "vestigial" organs, these useless body parts are leftovers from our evolutionary encestors, who actually needed them. Take your wisdom teeth, for example. Today they crowd our mouth and often need to get yanked by the dentist, but our primate ancestors had large jaws and needed the extra choppers in case some rotted away in the days before tartar-control toothpaste. Our tailbone or coccyx, is a leftover from animals that needed tails For balance or grasping tree branches.

Why do men have nipples???

They were there before you were even born. Human eyebrows in the womb develop according to a blueprint that is the same for males and females. Eventually the eyebrows begins to take on features specific to their sex, but not until after they have already developed nipples. Later in life, chemicals called hormones trigger changes in females so that they can nurse their young. Males don't have those hormones, so they are stuck with nipples that are nothing more that chest accessories. Most male mammals have nipples. Nipples don't cause males any harm, which is probably why evolution hasn't given them the heave-ho.

Why do I have a BABY BUTTON? 

For the same reason dolphins,cats, dogs, chimps, bats, and other "placental mammels"- animals nourished inside their mothers before birth-- have navels. In other words you can thank your mother for that lint collector on our stomach. Before you were born, when you were still developing on the womb, you were hooked up to your life-support system through a special cord that plugged into your navel. Through this "umbilical cord " you received food and oxygen and passed waste. The day you were born, you let out a cry and began breathing on your own. That let the doctor know he or she could cut off the umbilical cord, leaving you with a belly button as a souvenir. Whether it's an "innie" or an "outie", we all have one. 

Why do people get goose bumps?? 

Like your wisdom teeth and your tailbone, goose bumps serve no purpose in modern humans. They were created by itty-bitty muscles in our hair follicles, which raise the bumps as a reflex reaction to a sudden drop in temptature or feeling of panic, anger or extreme fear. Goose bumps fluffed up the body hair of our much furrier ancestors to help trap heat or make them look larger to the threatening animals. Today goose bumps just make you need to borrow a sweater.

Why do I have a..

Heart??
Your body's engine the heart pumps blood to every cell in your body.

Blood??
A mix of special cells and liquid "plasma". Blood delivers all the good stuff (oxygens, vitamins, minerals, and chemicals called hormones)  to the cell in your body and carries away the bad stuff (CO2 and other waste) for disposal. Red blood cells transport oxygen, while white blood cells  fight infection.special  cells called platelates Del the leak when blood vessels break -- a process called clotting. An oxygen carrying protein called hemoglobin is what gives blood it's red color.

Lungs?? 
Each breath you inhale fills these balloon-like organs with oxygen, which is absorbed into your blood: each exhalation expels CO2 from your blood.

SKIN?? 
Skin holds your insides in and protects your tissues from ultra-violet radiation from the outside. Skin in your body's largest organ. It is made of layers of cells that march to the surface and flake odd from friction. The outermost layer is entirely dead.

Tonsils? ?
These two meatballs shaped masses of tissue at the back of your throat are part of your lymph system , which includes a network of nodes that work like little security guards to battle infection.

Appendix?? 
This skinny tube in our digestive system is mostly useless today and can actually endanger your life if it becomes inflamed. Scientists suspect that the  appendix which replenishes essential bacteria in our guts, was an important organs Back before germs-fighting medicines helped humans overcome constant bouts of diarrhea.

Stomach ??
This expandable organs stores everything you eat and starts breaking down food with powerful acids.

Intestines??
The bulk of food digestion takes place in your small and large intestine, two tubes that absorb all the vitamins minerals mineral, and other nutrients from everything you eat.

Liver
Your body's biggest internal organ, the liver is like a complex chemical-processing plant. It converts nutrients from the small intestine into fuel your body can use. It makes bile, an essential substance for digestion. It cleans your blood of toxins and removes damaged red blood cells.

Kidneys
This bean-shaped  organ is so essential to good health that your body comes with a second one for free! Each kidney is crammed with more that a million microscopic filters-called nephrons --that skin the waste chemicals and other gunk from your blood.

PANCREAS??
This organs inject special protein substance called enzyme into your small intestine to break down carbohydrates for facts and energy, and proteins for bodybuilding materials. The pancreas also creates a crucial hormone called insulin,  which regulates the level of sugar in your bloodstream.

SPLEEN??
This fragile fist shaped sack is your body's infection fighter, filtering bacteria, viruses and other nasty invaders from your blood.

SKELETON ? ?
Remove all your bones along with the joints and muscles pinned to them and you would end up a shapeless, motionless bag of blood and organs. Your skull and spinal vertebrae, made of tough deposits of calcium and other minerals,  are like armor for your brain and nervous system. Special bone marrow in your vertebrea and elsewhere is your body's blood factory.  Your muscles and joints,  meanwhile,  set your human machine in motion.

Do you know interesting facts......
1. About 350 bones in the body of  birth.
2. An adult person has 206 bones.
3. Length of small intestine is 20feet(6 meter)
4. Length of blood vessels is 60,000 miles(96,560 KM)
5. Average volume of blood in an adult's body is 1.3 GALLONS(5 Liter).