Facts about the Human Body

Facts about the Human Body
Why do we hiccup?
Overeating, alcohol, amusement, or stress, can stimulate the phrenic nerve, which controls the diaphragm (the muscle layer that controls breathing). The diaphragm is then contracted. At the same time, glottis (part of the larynx where the vocal cords are) close to covering the course of the air, according to Patricia Raymond, MD, a gastroenterologist in Chesapeake, Virginia. That's when the hiccups occur every few seconds. Normal hiccups that happened a few minutes only, but in other cases also longer. How to cope, among others, by holding their breath, swallowing, or breathing in a paper bag.

Why do some people have very white teeth?
As well as eye and hair color, natural color of teeth is inherited from parents. "Some people have thin enamel-coating on the surface of a very white teeth, the enamel while others have a more yellow color," says Richard Price, a spokesman for the American Dental Association. Taking drugs such as tetracycline or amoxicillin antibiotics in childhood also affect the process of calcification that causes discoloration. Several types of certain foods also darken teeth. Coffee, tea, cola and red wine are some of them. If this happens, you should use tooth whitening products or specific treatments.

Facts about the Human Body

Facts about the Human Body

Why is yawning contagious?
A study published in the latest edition of the journal Cognitive Brain Research suggests that if you yawn because infected people who are near you are actually a form of empathy you to him. This is the same as if you laugh, and your friends laughing. "Yawning is not only triggered by seeing someone yawn, but also because of listening, reading, or even just by thinking about yawning," said Steven Platek, Ph.D., professor of psychology at Drexel University, Philadelphia, who led the study. Platek and his team believe that yawning is a catch in a primitive way of expressing feelings of others towards us.

Why are our heads dizzy while taking the ice?
Dizziness occurs when nerves in the palate massively stimulated by food or cold drinks. The nerves are there in the mouth, but the nerve centers in the brain, so that's where you feel pain. Then why do people feel the pain in one spot, whereas the stimulus in other places? Seymour Diamond, MD, executive chairman of the National Headache Foundation, says, "Eat or drink sipped slowly seems to reduce the cooling effect. Once getting dizzy, the quickest way to eliminate it is to drink something warm. "


Facts about the Human Body, are carrots really good for the eyes?
According to Michael F. Marmor, a professor of ophthalmology at Stanford University School of Medicine, carrots and all foods that contain vitamin A is good for the eyes. Vegetables eg red, yellow, orange, and green, including cassava, mango, and papaya, as well as eggs and liver. The body uses vitamin A to support the nerve cells in the retina that helps maintain normal vision. People who lack vitamin A commonly experience vision problems, such as night blindness.

Why is there dirt in the ear?
Facts about the Human Body, Cleaning the ears done to prevent foreign objects into the ear canal. Ear wax is produced by glands in the outer ear to protect the inner ear from infection. This sticky substance that actually prevents dust, dirt, or insects get into the ear. Ears can clean yourself. Dirt will be moving slowly up and out of the ears, dries up, then fall off, or washed away when you shampoo. If you take a bath, clean the outer ear only. "Ear canal is like a dead end," said Andrew Cheng, MD, an ENT specialist at the Manhattan Eye, Ear and Throat Hospital. "Cleaning the dirt with a cotton bud just making more dirt to get inside." You also can scratch the ear canal, eardrum or leaking.

Facts about the Human Body, Why do we shiver?
Happens when we are cold chills, or fear. When we are cold, the muscles around the pores to contract, causing the hairs stand hand to create layers of exile, according to Richard Potts, Ph.D., anthropologist and director of the Human Origins Program at the Smithsonian Institution's National Museum of Natural History, Washington, DC All mammals also experience this. However, "Human Body do not have enough body hair to respond: it is something left when we wore a furry coat," he explained. Potts and his team theorized, that many centuries ago, when the hair on our ancestors quite a lot, they seem much more frightening. "The beast will be back to look for prey that are not so scary," he continued.

Facts about the Human Body, Why do teens love sleeping late?
This is not because they are lazy. As a child, melatonin-a hormone that regulates sleep-wake cycle-issued glands in the afternoon. Entering puberty (10-14 years of age), the hormone melatonin is released more slowly, at around 9:00 p.m. to 22:00. "Shift it often makes teenagers are not able to fall asleep before 23:00 o'clock," said sleep expert teenager, Mary A. Carskadon, Ph.D., who is also director of the Bradley Hospital Sleep and Chronobiology Research Laboratory, in Providence. "Since teens still need to sleep nine hours or more, they are trying to 'pay' sleep time was wasted the night before with sleeping until noon."


Facts about the Human Body, Why are our hands and feet often cold?
"The nerves that control blood flow to the hands and feet are more sensitive in women than men," explains Mark Eskandari, MD, vascular surgeon at Northwestern Memorial Hospital, Chicago. "So once the temperature drops, constricts blood vessels, making blood flow more slowly." Women also have lower blood pressure than men. When you are cold or stress, and decreased blood pressure, blood is directed to the heart, away from the hands and feet.

Why could joints crack?
When you stretch your joints with, for example, jabbing knuckle or rotate your spine so that the sound of rattling, you can cause air bubbles that are formed between the bag inside the joint erupted. These bags to help cushion of air between the bone and keep it slippery. Breakdown of the joints are not too dangerous. "Menggeretakkan finger, ankle, knee or other joints does not cause arthritis, but also not a good habit. Acquired good taste at the very psychological nature menggeretakkan body, "said James Applegate, a family physician in Grand Rapids, Michigan.

Facts about the Human Body

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