Around us there are many mysteries concerning our bodies. For example, why yes we go yawn yawn when your friends? Or, why do we shiver? During this time we accept it, because they think it is a lot of things that God has created for us. Apparently, all these have scientific explanations. You want to know? Consider the following answer.
Why do we hiccup?
Overeating, alcohol, pleasure, 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) closed so that covers the course of the air, according to Patricia Raymond, MD, a gastroenterologist in Chesapeake, Virginia. When that happens hiccups every few seconds. Normal hiccups that occurred a few minutes only, but in other cases too much 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 antibiotic as a child 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 a tooth-whitening products or undergoing specific treatments.
Why is yawning contagious?
A study published in the last issue of the journal Cognitive Brain Research states that when you yawn because the infected person is near you is actually a form of empathy you to him. This is the same as if you laugh, and your friends laughing. "Yawning is not just triggered by seeing someone yawn, but also due to hear, read, or even just by thinking about yawning," says Steven Platek, Ph.D., professor of psychology at Drexel University, Philadelphia, who led the study. Platek and his team believe that yawning is a primitive way contaminated in expressing the 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 there are nerve centers in the brain, so that's where you feel pain. Then why do people feel pain in one spot, whereas the stimulus elsewhere? Seymour Diamond, MD, executive chairman of the National Headache Foundation, says, "Eat or be sipped slowly seems to reduce the effects of cold. Once getting dizzy, the fastest way to eliminate it is to drink something warm."
Are carrots are 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. For example vegetables red, yellow, orange, and green, including cassava, mangoes, and papayas, as well as eggs and liver. The body uses vitamin D 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?
Cleaning the ear is to prevent foreign objects into the ear canal. Earwax 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. The ears can clean yourself. Dirt will move slowly up and out of the ear, dried, and then fall off, or washed out 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 Manhattan Eye, Ear and Throat Hospital. "Cleaning the dirt with a cotton bud just make more dirt to get inside." You also can scratch the ear canal, eardrum or leaking.
Why do we shiver?
Occurs when we are cold chills, or fear. When we are cold, the muscles around the pores to contract, causing the hairs stand up hand to create a layer 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 are also experiencing this. However, "Humans 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 centuries ago, when the hair on our ancestors enough, they seem much more daunting. "The beast will be back to look for prey that are not so scary," he continued.
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. Pubescent (from age 10-14 years), the hormone melatonin is released more slowly, at about 9:00 p.m. to 22:00. "Shift This often leaves teenagers unable 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. "Since teens still need to sleep nine hours or more, they are trying to 'pay' sleep time was wasted the night before by sleeping until noon."
Why are the hands and feet are 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, blood vessels shrink, making blood flow more softly. " 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 the joint can be cracked?
When you stretch the joint with, for example, punched knuckles or rotate your spine so that the sound of rattling, you can cause air bubbles formed between the bag inside the joint erupted. These bags help to cushion of air between the bone and keep it slippery. Breakdown of the joints are not too dangerous. "Snapping finger, ankle, knee or other joints does not cause arthritis, but also not a good habit. Feel good that people get when snapping loss is psychological nature, "said James Applegate, a family physician in Grand Rapids, Michigan.
DIN
Sources: Real Simple
Read More...
