Question
(a) Complete Table by naming three sense organs and the stimulus which each
detects.
(b) Reflexes are involuntary actions coordinated by reflex arcs like the one shown in
Figure
(i) Explain what is meant by the term involuntary action.
(ii) The arm shown in Fig. 5.1 moves in response to the detection of heat.
Explain how the parts of the reflex arc shown in Fig. 5.1 bring about this response.
(iii) Describe the advantages of simple reflexes, such as the one shown in Fig. 5.1.
(c) The organs of the human body are coordinated by the nervous system.
Outline one other way in which these organs are coordinated.
Answer/Explanation
Ans:
Question
Figure shows a diagram of human skin in cold weather
(a) Table shows the responses of the skin to cold weather.
Complete the table by:
• naming the parts of the skin that respond to cold weather
• using the letters (P to V) from Fig. 3.1 to identify these parts of the skin.
(b) The response of the skin to cold weather is an involuntary action.
Explain how an involuntary action differs from a voluntary action.
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(c) Describe how the nervous system coordinates the response of the skin to cold weather.
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(d) Explain how negative feedback is involved in the control of body temperature.
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Answer/Explanation
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