ANT203H5 Chapter Notes - Chapter 16: Vasodilation, Hemoglobin, Red Blood Cell
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Acclimatisation the physiological adjustment of individual organisms to different conditions. >the length of time in which these reversible changes occur can vary. *as warm blooded creatures, humans have the ability to maintain a constant body temperature cold stress. To increase heat production temporarily > shiver which increases metabolic rate. Vasoconstriction: the narrowing of blood vessels which reduces blood flow and heat loss. Vasodilation: the opening of blood vessels to increase blood flow and heat loss. *both must operate back and forth to maintain a balance between heat loss and damage to extremities. Lewis hunting phenomenon: the alternating cycle of vasoconstriction and vasodilation. skin temperature changes more quickly, but the increases and decreases are not as great. The smaller and more frequent cycles are most efficient heat stress: Your body is not removing heat quickly enough. 4 ways in which heat is lost from body, 3 of which can also increase heat:
