Maintaining a constant body temperature is of crucial importance to the survival of living organisms.
Explain the importance to certain organisms of maintaining a constant body temperature.
The regulation of body temperature involves negative feedback loops.
State what is meant by the term 'negative feedback loop'.
The following statements describe changes that occur in the skin in response to a change in temperature.
- Vasodilation of the arterioles near the skin will allow blood to flow to the capillaries.
- The activity of the sweat glands is reduced.
- Erector pili muscles in the skin contract to trap air between hairs.
- Blood is diverted through shunt vessels in the dermis of the skin.
Which of these statements would apply in hot conditions?
(1)
☐ | A | I only | |
☐ | B | IV only | |
☐ | C | I, II and III | |
☐ | D | II, III and IV |
The regulation of body temperature is controlled by the brain.
Name the part of the brain responsible for thermoregulation.
(1)
In prolonged cold conditions, the body will release the hormone thyroxine to regulate body temperature.
Describe the mechanism by which thyroxine is responsible for thermoregulation.
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