blood levels

the relative amounts of various substances in a measured amount of blood. Blood levels involve comparison of observed levels with an amount or range taken to be normal or toxic. The amount may be expressed as a percentage, in milligrams or micrograms per 100 milliliters, millimoles, or micromoles per liter, or a similar measure. Also called circulating levels.

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Psychology term of the day

February 17th 2025

sexually dimorphic nucleus

a nucleus of the central nervous system that differs in size between males and females. In humans, for example, a nucleus in the medial preoptic area of the hypothalamus that synthesizes gonadotropin-releasing hormone tends to be larger and more active in males than in females because gonadotropin release is continuous (it is cyclical in females). In songbirds whose males sing more than females, several brain nuclei associated with both song learning and song production are larger in males than in females.