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Homeostasis and thermoregulation

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Question 12

The diagram below shows the blood flow pathway through the skin of a mammal.

Skin Blood Flow

When the core body temperature of the mammal falls below the optimum set point, physiological thermoregulatory mechanisms are activated to minimize heat loss.

Which of the following rows correctly describes the state of the smooth muscles in the walls of Vessel X X\,X and Vessel YYY, and the resulting effect on heat loss by radiation?

Smooth muscle in Vessel XXX: Relaxes
Smooth muscle in Vessel YYY: Contracts
Heat loss by radiation: Increases

Smooth muscle in Vessel XXX: Contracts
Smooth muscle in Vessel YYY: Contracts
Heat loss by radiation: Decreases

Smooth muscle in Vessel XXX: Contracts
Smooth muscle in Vessel YYY: Relaxes
Heat loss by radiation: Decreases

Smooth muscle in Vessel XXX: Relaxes
Smooth muscle in Vessel YYY: Relaxes
Heat loss by radiation: Increases

Homeostasis and thermoregulation Questions

  1. GCSE
  2. /Biology
  3. /Homeostasis and thermoregulation