15 Amazing Things About the Human Body

Here are fifteen freaky, unusual, or hard-to-believe facts about the human body. Some are a bit grosser than others, but all are true. How many did you already know about, before reading this article?
15. Your Height Changes – In the Same Day
If you measure your height before going to bed, and then measure your height again when you wake up, you'll be surprised by the difference. This is because your spine expands a little bit overnight. As more fluids enter while you're lying down, the spine can expand and lengthen. During the day, as you sit or stand, your spine compresses due to gravity and the weight of your head.
14. Your Bones are Super Strong.
When it Comes to Bearing WeightA very small piece of human bone can hold up, without being crushed, as much as nine tons! This, sadly, does not keep our bones from breaking if they are twisted or bent beyond what they are designed to handle.
13. Have You Ever Tried to Tickle Yourself ? 
It's Nearly Impossible People, with only a handful of exceptions, are unable to tickle themselves. This is because of the difference in expectancy levels. If you expect to feel a sensation, your senses are dulled to it. However, if you don't expect it, then your sensitivity to the stimuli is higher, and so is your reaction. Since you expect to feel it when you try to tickle yourself, the sensation is much less, and you don't feel it as tickling. This is also why when someone unexpectedly tickles you, you feel it even more strongly than if you had known in advance that they were going to tickle you.
12.Intelligence can be Lost Brain Cells and Their Connections are Vital to Intelligence.
Losing over a thousand brain cells a day leads to a slow reduction in intelligence from one day to the next. While it might be a slow reduction, these facets of intelligence are based on your memories. These can include factual things, such as math functions to recipe ingredients, and also memories of events in your life, leaving blanks here and there. While this might sound terrible, these are usually not lost if the information stored in your brain is continually brought up on a regular basis. This is because new connections are formed between those cells and other cells, so when one dies, the others can do the work instead, keeping your memories going. However, slowly, those instances that you rarely use will become less and less available over time, simply because new connections aren't formed.
11. Which Nostril do You Breathe Through? 
Most People Only Use One Side!
Subconsciously, one nostril is actually closed off in most people, permitting air flow through only one side. Because a little bit of air still travels through the mostly-closed nostril, this isn't noticed until a cold hits, and the nostril is more constricted, blocking complete air flow. Those who breath through their left nostril are more creative and those who use their right side are more logical.
10.Your Heart is Your Strongest Muscle.
It's Also the Most Active Pumping blood through your cardiovascular system at a rate of over 40 million times a year is no small feat. 
This pumps the equivalent of 2000 gallons of blood a day. While you might only have about five quarts of blood in you, constantly circulating it helps keep it clean. The long bones create new red blood cells that replenish the damaged ones. Damaged red blood cells are removed by the liver on a daily basis, leaving only the best ones to carry oxygen, nutrients, and wastes to their destinations throughout the body.
9. Eye Crusties Only Happen at Night – Here's Why They Don't Happen When You're Awake Eye crusties are formed from gound, which is a mixture of oils, sweat, tears, mucus, dead skin cells, and irritants that have accumulated around the edges of your eyelids.
Some people have a larger build up than others, and this can actually cake the eyelids shut. If this is a problem you face (no pun intended), you can decrease the amount that builds up overnight by washing your eyes before going to bed. Just use cool to warm water and splash water on your eyes while they are closed. Pat dry with a non-linty towel.
8. Your Stomach is a Chemical Powerhouse One.
Thing Keeps it from Digesting Itself Your stomach is a very powerful organ that can digest many things without any problem. It is so strong, that it could even digest itself. This is what an ulcer is. Most people do not have ulcers because they have a thick coating of a protective substance that keeps the acid in the stomach from touching the stomach itself. That coating is made up of mucus! Without mucus coating the stomach's interior, the acid would quickly leave you without a stomach. This lining is not only thick, but it is also being added to, in order to keep the acid from stripping it away. This results in a completely new lining being made every two or three days.
7. A Runny Nose isn't Always a Sign of Illness Healthiness can Also be Irritating An increase in the production of mucus in the nasal passages is something your body creates to cope with an invasion of germs, or cold air. 
Cold air can irritate the lungs, and also cool down the blood that circulates through them. This in turn can also cool your entire body off. This can be extremely dangerous if you are outside in cold weather. So instead, your nose and the nasal passages inside will create much more mucus in order to protect the lungs, blood, and you from the cold's onslaught. The increase in mucus comes along with an increase in the size of the nasal passages, as they swell up with blood, in an attempt to warm the interior of your nose.
6.A Hidden, but Quite Visible, and Rather Large Organ A Very Important One, Also One organ that you have is one you might not think about as such, but it is one of the largest ones, both by size and by weight. Your skin covers you from head to toe, has different surfaces, amounts of hair, and even sensitivity levels. This organ is as important as it is diverse. Without it, you would not have the protection you need against heat or cold, invasion by bacteria and other pathogens, and you would also be in constant pain.
5. No Pain, No Gain Gets Another Take – What Really Causes that Burning Sensation? 
Those who start working out, or increase their level of exercise, often experience a burning sensation in their muscles. This was believed to be from a build up of lactic acid that hadn't had time to be flushed out of the muscle tissue. Now, researchers believe that the real reason for the burn is microscopic tears in the muscle fibers themselves, and not a build up of lactic acid. As these tears are repaired, the muscle mass is increased. This is why muscle is built up over time.
4. Weight Gain Doesn't Just Add Fat to Your Body – Your Body Creates New Blood Vessels, Too Every time you gain weight, your body must also provide nutrients to those newer and larger fat cells. 
This is the reason that being heavier is so hard on the heart. Fat cells can become quite large before they divide into two cells, but the larger area they are in must have adequate blood flow. A decrease in weight uses up extra fat that is stored in the body, and as the body decreases in size, the blood vessels needed are also fewer. These are absorbed back into the body, though.
3. We Are Human, But We are Not  We have More non-Human Cells than Human Cells. The average adult human body has over ten trillion cells that are human. That sounds like a lot, but there are non-human cells inside the human body in numbers many times more than that. Thankfully, the majority of them are beneficial, and we wouldn't be healthy without them. Many help us by helping to digest our food, as the majority are found in the stomach and digestive tract alone. Others are found on the skin, helping fight invaders that would harm us. They are also found in the vaginal tract of women, and if these are killed off by using antibiotics, a yeast infection is often the result.
2. Your Body Doesn't Just Need Warmth, It can Create Heat. You don't have to be in a cold environment and shivering to create heat. Your body creates heat all of the time, during all types of activities, from exercising to even going to the bathroom. Being warm-blooded means creating our own heat and not being dependent on the environment like many amphibians and reptiles are. We create so much heat that if harnessed, it could be used to cook food or heat homes.
1. Only Five Senses? Really? 
No, We Have Many More than That!. Humans are said to have five senses, hearing, smell, sight, touch, and taste. But in reality, there are several more. There is the sense of pressure, which can be atmospheric or something placed on you, and also the sensation of your own body parts, such as feeling your heart beating, or your stomach rumbling, you eye twitching, or an itching feeling, and tension in muscles. Hunger is another sense that we have, along with thirst.
Opposite that is a feeling of being full, which can increase as we eat more at a meal. Tiredness is another sensation, as is sleepiness. The two are similar, but different. Some believe that the perception of time passing is anther sense that humans have. We know animals have it, as they prepare for winter by storing food. If animals have it on a yearly scale, then humans should be considered having it on a much smaller and more detailed scale than animals.
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