Hot fish hit concrete temperature ceilings
نویسنده
چکیده
Upon submersion, mammalian divers invariably exhibit a characteristic ‘dive reflex’: the heart slows and the peripheral vessels, supplying blood to muscles and non-vital organs, constrict, thereby prioritising blood flow to the brain. This stereotyped response, dubbed ‘the master switch of life’ by Per Scholander following his pioneering work, imposes unusual demands on the major arteries. The slowed heart rate results in greater cardiac filling between beats, meaning the volume pumped per contraction (stroke volume) increases. However, this large volume of blood is driven against a high resistance generated by the peripheral vasoconstriction, thus putting strain on the central vessels.
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