The diagram shows part of the temperature-control system in a human body. Receptors in the skin and in the brain detect changes in the temperature of blood....
Question 1 Report
The diagram shows part of the temperature-control system in a human body. Receptors in the skin and in the brain detect changes in the temperature of blood. The control centre sends messages to effectors, including sweat glands and muscles. A student has a fever caused by a disease. At first, the student feels cold even though their measured body temperature is rising. Later, the student sweats as the fever falls. This is an example of negative feedback because responses act to return temperature towards a normal value.
(a) Identify the organ containing the main temperature-control centre. [1]
(b) Use Fig. 1 to state one effector involved when body temperature is too high. [1]
(c) Explain how shivering can raise body temperature. [2]
(d) Explain why temperature control is described as negative feedback. [1]
Answer Details
(a) Brain / hypothalamus [1] (b) Sweat gland / skin blood vessel [1] (c) Muscles contract rapidly [1]; respiration in muscle cells releases thermal energy / generates heat [1] (d) The response opposes the original temperature change and returns temperature towards normal [1]
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