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If the motor nerve from the spinal cord to the muscle is damaged why will hand withdrawal after touching a hot object be affected?

Answer and explanation

Correct answer: Because the command will not reach from spinal cord to effector

A reflex arc follows this route: receptor in the skin detects heat, a sensory neuron carries the impulse to the spinal cord, and a motor neuron carries the response to the muscle, the effector. If the motor nerve is damaged, the spinal command cannot reach the muscle, so withdrawal becomes weak or absent even though the receptor may still detect heat. Thus option B is correct.

Related tags

Reflex-ArcMotor-NerveSpinal-CordControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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