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).