New cells are created from existing cells through a process referred to as the cell cycle. One cell can make a copy of itself and form two new daughter cells.
A concussion is defined as a traumatic blow to the head coupled with some kind of altered consciousness. Some people refer to it as seeing stars, getting your bell rung. People may feel disoriented for a period of time.
Infectious agents—both bacterial and viral—are responsible for about 25 percent of all human cancers. The virus infection does not by itself cause cancer, but can interfere with a cell’s normal maintenance of things.
Swallowing is one of the most obvious functions the epiglottis serves, because it hoods over the airway, or larynx, when you eat and drink. When you swallow, the muscles in your throat respond by pulling the voice box up and underneath the tongue, and the epiglottis is pulled to cover over the larynx.
Freckles are composed of an ingredient called melanin, which protects against damage caused by UV light. Your body makes melanin to protect itself from sun damage.