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Thermoregulation - Anatomy & Physiology (view source)
Revision as of 14:33, 5 August 2008
, 14:33, 5 August 2008no edit summary
#**Sweat Gland Activity
#**Sweat Gland Activity
#**Activity of the smooth muscles which regulate fur/plumage thickness
#**Activity of the smooth muscles which regulate fur/plumage thickness
==Adaptation to Heat==
*Sweating - causes heat loss via evaporation.
*Reduction of the resistance of cutaneous arterioles = ''Vasodilation''. This allows more heat from the circulation to be transferred to the air.
*[[Hair - Anatomy & Physiology|Hairs]] on the skin lie flat - the ''arrector pili'' muscle attached to the proximal end of each hair follicle relax to minimise heat being trapped by the hairs.
==Adaptation to Cold==
*Sweating Stops
*Cutaneous arteries constrict - ''Vasoconstriction''. This minimises heat loss from the blood to the body surface.
*[[Hair - Anatomy & Physiology|Hairs]] on the skin are raised involuntarily by the ''arrector pili''