Analyse coordinated vasodilation, vasoconstriction, sweating, shivering and brown-fat heat production as mammalian thermoregulation mechanisms.
Average human internal (core) body temperature is 36.4∘C, with slight variations between day and night. The average surface temperature of the Earth in the 20th century was 13.9∘C. It has now risen to 14.8∘C.
Outline one change that happens in the human body in response to a rise in body temperature above 36.4∘C.
a. sweating/sweat secretion;
b. vasodilation / skin arterioles widen / increased blood flow to skin;
c. shunt vessels in the skin close;
b. Do not accept' blood
vessels widen' unless the answer indicates that more blood will flow to the skin.
1 max