O-LevelBiologyCoordination & Response5090/11 · May/June 2021 · Q201 Mark

The diagram shows the homeostatic control of body temperature. What are corrective mechanisms P and Q and coordinator R? [Figure 9.1]

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AP sweating, Q more blood flows close to the skin surface, R brain

BP sweating, Q more blood flows close to the skin surface, R skin

CP shivering, Q less blood flows close to the skin surface, R brain

DP shivering, Q less blood flows close to the skin surface, R skin

✓ Correct answer

A: P sweating, Q more blood flows close to the skin surface, R brain

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2021 Paper 1 Variant 1, question 20.

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