1[1 mark]
Which of these is an effector in a control system of the human body?
- Temperature receptors in the skin
- The spinal cord
- Skeletal muscle that contracts
- Sensory neurones
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Answer: C C: effectors are muscles or glands (1)
2[2 marks]
State what is meant by homeostasis.
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- regulation of the internal conditions of a cell or organism (1)
- to maintain optimum conditions for function (1)
- in response to internal and external changes (1)
- Max 2