The diagram shows the route of nerve impulses when a person accidentally touches the hot metal cap of a camping stove. This rapid response protects the body...
Question 1 Report
The diagram shows the route of nerve impulses when a person accidentally touches the hot metal cap of a camping stove. This rapid response protects the body before the person is fully aware of pain.
(a) Name the type of neurone that carries impulses from the skin receptor towards the spinal cord. [1]
(b) Name the type of neurone that carries impulses from the spinal cord to the arm muscle. [1]
(c) Describe the sequence of events that causes the person's hand to move away from the hot cap. [3]
(d) Explain one advantage of this response being a reflex. [1]
Answer Details
(a) The neurone carrying impulses from the skin receptor towards the spinal cord is a sensory neurone. [1]
(b) The neurone carrying impulses from the spinal cord to the arm muscle is a motor neurone. [1]
(c) A receptor detects heat, which is the stimulus. Impulses travel along a sensory neurone to the spinal cord and pass through a relay neurone. Impulses then travel along a motor neurone to the muscle, causing it to contract and move the hand away. [3]
(d) A reflex is rapid, so it reduces the time for which tissues are exposed to heat and reduces injury. [1]
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