mitochondrion

n. (pl. mitochondria) an organelle that is the main site of energy production in cells. Mitochondria are most numerous in cells with a high level of metabolism. They have their own DNA (mitochondrial DNA). —mitochondrial adj.

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Psychology term of the day

December 25th 2024

defense reflex

a sudden response elicited by a painful or unexpected stimulus. The term is applied to a variety of responses, ranging from an acceleration in heart rate in reaction to a startling auditory stimulus; through flight, fight, or freezing elicited by perceived threat; to complex psychological responses. Also called defense response.