A sex chromosome in certain animals, such as chickens, turkeys, and moths. In humans, males are XY and females XX, but in animals with a Z chromosome, males are ZZ and females are WZ.
- Crack (drug)
The street name given to cocaine that has been processed from cocaine hydrochloride to a ready-to-use free base for smoking. Rather than requiring the more volatile method of processing cocaine using ether, crack cocaine is processed with ammonia or sodium bicarbonate (baking soda) and water and heated to remove the hydrochloride, thus producing a form […]
Affect: The emotional tone a person expresses. A person’s affect may be appropriate or inappropriate to the situation. One type of inappropriate affect is a flat affect or blunted affect, a common feature of schizophrenia.
- Affective disorder, seasonal (SAD)
Affective disorder, seasonal (SAD): Depression that tends to occur (and recur) as the days grow shorter in the fall and winter. It is believed that affected persons react adversely to the decreasing amounts of light and the colder temperatures as the fall and winter progress. Seasonal affective disorder has not been recognized very long as […]
Afferent: Carrying toward. A vein is an afferent vessel because it carries blood from the body toward the heart. The opposite of afferent is efferent.