You may not think about it very often, but there is so much to learn about the human body. For example, did you know that people are actually covered with invisible stripes? In this article, taken from an episode of The List Show, we take a look at some fascinating facts about the human body that you may not know.
1. Only humans have chins.
Humans are the only animals with a chin. While you may think that every animal has one, we call it the very bottom of the head. In reality, a chin is a very specific bone feature that extends forward from the lower jaw. Some experts suggest that elephants and manatees have chin, others argue that they are so fundamentally different structures that they should not be compared to humans. Experts are still not sure why people have developed into chin. The reason could be eating or speaking, or they may have occurred as a side effect of another useful function.
2. People have a strange bone called the hyoid bone.
The hyoid bone is a special bone that humans have. This is the one bone that does not form a joint with another bone. Instead, it is connected to muscles and ligaments. The hyoid bone sits between the jaw and the voice box and is used to hold all of the lower mouth muscles in place. It also helps with swallowing and speaking.
3. People with more hair and innie belly buttons are more prone to fluff.
Hairy people with innie belly buttons are more susceptible to belly button fluff, which comes from fibers that rub off their clothing over time. Your belly hair grabs the fibers and pulls them into your belly button.
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4. While it varies from person to person, fingernails grow faster than toenails.
Your fingernails grow faster than your toenails. Although it varies from person to person, fingernails usually grow about a tenth of a millimeter every day, while toenails grow about half as fast. There is a correlation between the speed of nail growth and the length of the next bone. This means that your longest fingers have faster growing nails than your shorter fingers.
5. Fingernails grow faster on your dominant hand.
Your fingernails grow faster on the hand you write with. Nobody knows why.
6. Your nails change with age.
In particular, they grow more slowly and then known as nail cells Onychocytesstart to accumulate. That is why older people have thicker toenails. Fingernails are not that different because people handle them better and our toes suffer great damage all our lives.
7. It is a misunderstanding that people’s hair and nails continue to grow after they die.
What actually happens is that the skin dries out and then goes back. So it looks like the hair and nails are getting longer, but in reality the skin is getting shorter.
8. Breastfeeding does not cause the breasts to sag.
It is a common misconception that breastfeeding causes your breasts to sag. Pregnancy itself can affect the breasts because they stretch and can then recover differently. However, breastfeeding studies confirm that the breasts will not sink. A behavior that will smoke, however.
9. Hands and feet contain more than half the bones of an adult body.
With about 27 bones in each of yours Daddles– that’s an old slang word for the hands – and about 26 bones in each of you Meat plates– which is another old slang term for feet – these appendices make up more than half of an adult’s bones, of which there are a total of about 206. But that’s not always true. The feet usually contain cartilage at birth, then bones form over time. They only harden completely when people are in their early twenties.
10. You can only break a rib by sneezing.
While it is rare, it is possible to break a rib by sneezing. In 1885 there was an article in the Journal of the American Medical Association about a 72-year-old man who broke his eighth rib while sneezing. SneezeIncidentally, it is an Australian slang term from the 1940s that means “excellent, wonderful” and could definitely describe a good sneeze – but probably not one that would break a rib.
11. You can see stars when you rub your eyes.
If you’ve ever seen stars while rubbing your eyes, don’t imagine that. The cells in our eyes interpret the pressure as input and treat it the same way as light input.
12. Goosebumps are practically useless.
Goosebumps are often associated with the release of adrenaline in the body, for example when we feel a particularly strong emotion. They used to be important when people had a lot more hair on their bodies because goose bumps raised that hair and made a person look taller when in danger. But now they’re a pretty useless feature.
13. Spleens help the immune system.
The spleen is surprisingly not completely useless, although this was believed until the 1950s. It is okay to remove your spleen, but it supports the immune system. While blood is in the spleen, the immune system generates the necessary antibodies to fight bacteria in that blood. The spleen of a fetus also produces red blood cells.
14. The appendix seems to help the immune system.
It’s okay to remove your appendix, but the organ also supports the immune system. In 2018, Dr. Mohamad Abouzeid, assistant professor and surgeon at NYU Langone Health told Mental Floss: “[The appendix] has a high concentration of immune cells in its walls. “Experts don’t know exactly how the attachment affects the immune system, but it seems to play a role in keeping us healthy.
15. The face of a fetus forms in the first three months after conception.
In the first three months after conception, the face of a fetus comes together and fuses in the area of the top of the lip. That is, the dent under the nose, which is referred to as Philtrumis evidence of the time of a person in the womb.
16. Babies don’t just see in black and white.
A newborn has a pretty terrible view. However, it is not true that they can only see in black and white. If in reality there is a large amount of the color red, you can identify it, but only if it is displayed in front of gray. Newborns have about 5 percent of the visual acuity that adults have, but it improves quickly and only takes about six months to see about as well as an adult. However, there are some eye tests that babies can use to teach adults about subtlety. For example, a baby up to the age of 6 months can distinguish monkeys, while older babies and adults cannot.
17. The liver can regenerate itself very well.
In fact, it can regenerate with only 25 percent of the original liver tissue. Liver transplants are usually only required if someone has suffered severe damage to the organ or an injury.
18. Some people are born with three kidneys.
Some people had kidney tears when they were still in the womb, so they were actually born at three. This makes them the main candidates for a donation, but the problem is that people often don’t know when they have three kidneys.
19. A person’s colon can be stretched 5 feet and the small intestine 20 feet.
The gut is quite long: the small intestine stretches up to about 20 feet and the colon strikes 5 feet. The surface of your gut could take up two whole tennis courts, although some Swedish researchers have downgraded them to the size of a studio apartment. However, compare that to a blue whale that has a gut over 700 feet.
20. The stomach can hold up to 50 ounces of fluid.
The stomach may not be the size of a tennis court, but it can hold about 16 to 50 ounces of fluid. It is interesting to note that a trenta size at Starbucks is 31 fluid ounces, which is more than many adult stomachs can technically hold.
21. The neurotransmitter serotonin is in the intestine.
Our gut contains 95 percent of the neurotransmitter serotonin. In fact, the gut, with its 100 million neurons, is so important for mood that it is sometimes referred to as the “second brain”. Medications that affect serotonin often also cause GI problems.
22. The skin is the largest organ.
The skin is considered an organ and is the largest of the body. An adult can have 22 square feet of skin on his body. Basically, this means that your skin can comfortably extend over half the floor of the typical bathroom.
23. The skin makes up a large part of your body weight.
Fifteen percent of your total body weight, to be precise.
24. The ovaries are connected to the brain.
It used to be thought that the ovaries and uterus were dormant until needed, but the ovaries actually communicate with the brain in a way we are only learning about. The hypothalamus and ovaries work together to ensure that hormone levels in the ovaries, such as estrogen and progesterone, are where they need to be.
25. Man is covered with stripes.
The human body is covered with stripes called Blaschko lines, which are usually invisible. They are cellular relics of our development from a single cell to a fully trained human being.
26. People shine, but our eyes cannot see it.
People shine, but it’s only about 1000 times weaker than our eyes can see. Every animal that has metabolic reactions lights up because it emits photons and causes light. In 2009, a study was published in which a camera captured the bioluminescence of five men. According to this study, our upper body lights up the most. And the glow is in one cycle; If we have a normal sleep schedule, our bioluminescence is strongest at around 4:00 p.m.