The Secret of Human Body

The human body is the entire structure of a human organism, and consists of a head, neck, torso, two arms and two legs. By the time the human reaches adulthood, the body consists of close to 100 trillion cells, the basic unit of life. These cells are organized biologically to eventually form the whole body.

Why do we hiccup?

Overeating, alcohol, excitement, 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, the glottis (part of the larynx where the vocal cords are) shut down so that it covers the course of the air, according to Patricia Raymond, MD, gastroenterologist in Chesapeake, Virginia. When that happens hiccups every few seconds. Normal hiccups that happened a few minutes, but in other cases too much longer. How to overcome the other by holding their breath while 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 enamel-thin layer on the surface of a very white teeth, enamel while others have a more yellow color," says Richard Price, a spokesman for the American Dental Association. Drugs such as tetracycline or amoxicillin antibiotic childhood also affect the process of calcification that causes discoloration. Several types of specific foods also darken teeth. Coffee, tea, cola, and red wine are some of them. If this happens, you have to use teeth whitening products or a particular treatment.

Why is yawning contagious?

A study published in a recent issue of the journal Cognitive Brain Research states that if you yawn because infected people who are near you is actually a form of empathy to her. This is the same as if you laugh, and your friends laugh. "Yawn is not only triggered by seeing someone yawn, but also for listening, reading, or even just thinking about yawning," said Steven Platek, Ph.D., professor of psychology at Drexel University, Philadelphia, who led the study. Platek and team believes that contaminated yawning is a way of expressing primitive feelings of others towards us.

Why 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 center in the brain, so that's where you feel pain. So why do people feel pain in one place, whereas stimulus elsewhere? Seymour Diamond, MD, executive Chairperson of the National Headache Foundation, said, "Eat or sip drinks slowly seems to reduce the effects of cold. Soon getting dizzy, the fastest way to eliminate it is to drink something warm."

Are carrots really good for your 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. For example, vegetables 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 help maintain normal vision. People who lack vitamin A commonly experience vision problems such as night blindness.

Why is there dirt in the ear?

Ear cleaning 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 into the ear. Ears can clean yourself. Dirt will move slowly up and out of the ear, dried, and then fall off, or washed out when you wash it. If you take a shower, wash only the outside of the ear. "Ear canal is like a dead end," said Andrew Cheng, MD, an ENT specialist at the Manhattan Eye, Ear and Throat Hospital. "Clean the dirt with a cotton swab just to make more dirt to get inside." You can also scratch the ear canal or eardrum puncture.

Why do we get goosebumps?

Happens when we are cold chills, or fear. When we are cold, the muscles around the pores to contract, causing the hairs standing hand to create a layer of isolation, 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, "People do not have enough body hair to respond; thing is something that is left when we are wearing a furry coat," he said. Potts and his team theorized that centuries ago, when the hair on our ancestors quite a lot, they seem much more daunting. "The beast will be back to search for prey that is not so scary," he continued.

Why teenagers happy sleeping late?

This is not because they are lazy. As a child, melatonin, a hormone that regulates the sleep-wake cycle-removed 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," says sleep expert teenager, Mary A. Carskadon, Ph.D., who is also director of the Bradley Hospital Sleep and Chronobiology Research Laboratory, in Providence. "Because adolescents still need to sleep nine hours or more, they are trying to 'pay' sleep time was wasted the night before to sleep until noon."

Why are our hands and feet are cold?

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

Why can crack joints?

When you stretch your joints, for example, pressing knuckles or twist your spine so that the sound of rattling, you can cause air bubbles that form in the joints between the bag broke. These bags help cushion of air between the bone and keep it smooth. Breakdown of the joints are not too dangerous. "Ground his fingers, ankles, knees or other joints does not cause arthritis, but also not a good habit. Obtained the good taste when ground his body very psychological nature, "said James Applegate, a family physician in Grand Rapids, Michigan.