Edexcel IGCSE Biology 2.93 Skin and Temperature Regulation Questions

The skin limits heat loss in cold conditions and increases cooling when hot. Connect sweat evaporation and skin blood flow to temperature control.

Exam points

Explain how vasodilation or vasoconstriction changes blood flow near the skin and heat loss.
Explain how sweating and evaporation cool the body during exercise or heat exposure.
Describe the skin response to cold, including reduced sweating and constriction of arterioles near the surface.
Interpret data relating age and heat strain to skin temperature and sweating rate.
Identify sweat glands, their pores and blood-carrying capillaries in a skin diagram.

[Maximum number: 3]

The skin is an organ involved in temperature regulation.

The diagram shows a section of human skin.

Explain how the skin capillaries regulate body temperature when the body temperature increases.

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