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Allan gingerly puts his fingertips on the hot handle of the skillet in which he's cooking supper, but he instantly pulls his hand away. His reaction is due to the functioning of the ________.

Question

Allan gingerly puts his fingertips on the hot handle of the skillet in which he's cooking supper, but he instantly pulls his hand away. His reaction is due to the functioning of the ________.

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Solution

The blank in the sentence should be filled with "nervous system". Allan's reaction is due to the functioning of the nervous system. When Allan touches the hot handle, sensory receptors in his skin detect the high temperature. This information is sent to his brain via sensory neurons. His brain interprets this information and sends a signal via motor neurons to the muscles in his hand, causing him to pull his hand away. This is a reflex action controlled by the nervous system.

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