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.
Frequently asked questions
What is the correct answer to this question?
Because the command will not reach from spinal cord to effector
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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