— the lower incidence of allergy in those living on farms or in rural areas (due possibly to more exposure to bacteria in barns and elsewhere in the country); the lower incidence of allergy in younger children of large families with 3 or more older siblings (due perhaps to repeated exposure to infection from older siblings); and the lower incidence of asthma and wheezing in children who go to day care centers (where they are exposed to more infections). The hygiene hypothesis, however, cannot explain the higher rates of allergic asthma among poor African Americans in the inner city areas.
A thin membrane that may completely or partially cover the vaginal opening before first sexual intercourse but that usually disappears before puberty.
The muscle that permits the tongue to be held on the floor of the mouth.
Prefix meaning high, beyond, excessive, or above normal, as in hyperglycemia (high sugar in the blood) and hypercalcemia (high calcium in the blood). The opposite of hyper- is hypo-.
- Hyper-IgD syndrome
A genetic disorder characterized by recurring attacks of chills and fever that usually start before the first birthday and last for 4 to 6 days, usually accompanied by swollen glands in the neck and abdominal pain with vomiting or diarrhea. Other symptoms may include headache, joint pain (arthralgia), arthritis of the large joints, and reddish […]
A higher than normal level of activity. An organ can be described as hyperactive if it is more active than usual. Behavior can also be hyperactive. People who are hyperactive always seem to be in motion. They can’t sit still; they may dash around or talk incessantly. Sitting still through a lesson can be an […]