diving reflex

noun

, Physiology.

1. a reflex of humans, other mammals, reptiles, and birds, triggered by immersion in cold water, that slows the heart rate and diverts blood flow to the brain, heart, and lungs: serves to conserve oxygen until breathing resumes and to delay potential brain damage.

Word History and Origins

Origin of diving reflex¹

First recorded in 1975–80

Example Sentences

The diving reflex instinct seems to disappear by six months in most cases.

From Popular-Science