CAIE IGCSE Biology 14.4.8 Vasodilation & Vasoconstriction

Practise explaining how skin arterioles alter surface-capillary blood flow and heat loss in hot and cold conditions.

Exam points

link vasodilation in hot conditions to greater blood flow through surface capillaries
link vasoconstriction in cold conditions to reduced surface blood flow and heat loss
interpret arteriole, shunt-vessel and capillary diagrams to predict blood-flow routes

[Maximum number: 3]

Fig. 6.1 is a flow chart of some of the events that occur to maintain a constant body temperature.

Fig. 6.1

Describe how shunt vessels in the skin function to help cool the body when the body temperature is high.

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