A fisherman in Tobago suffered a deep cut to his hand while handling fishing nets. He immediately felt sharp pain, then withdrew his hand before he had time to think about it. Which part of the nervous system coordinates the IMMEDIATE withdrawal of the hand?

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Question

A fisherman in Tobago suffered a deep cut to his hand while handling fishing nets. He immediately felt sharp pain, then withdrew his hand before he had time to think about it. Which part of the nervous system coordinates the IMMEDIATE withdrawal of the hand?

Accepted Answer

The spinal cord acting as a reflex arc — Award 1 mark for recognising that the spinal cord, not the brain, coordinates a spinal reflex response. In a reflex arc, the sensory neurone carries the impulse to the spinal cord, where a relay neurone connects directly to a motor neurone, producing an involuntary, rapid withdrawal response without waiting for cerebral processing. B is incorrect — the cerebrum is involved in conscious thought and voluntary action, not the immediate reflex withdrawal. C confuses the medulla oblongata (which controls autonomic functions such as heart rate and breathing) with the reflex arc pathway.

Answer

The medulla oblongata sending motor impulses

Answer

The peripheral nervous system transmitting signals to the cerebellum

Answer

The cerebrum processing the pain signal

Answer

The spinal cord acting as a reflex arc

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