Why does the spinal cord play a bigger role than the brain when the hand is pulled back after touching a hot object?
Answer and explanation
Correct answer: Because the spinal cord produces a quick reflex response
The governing concept is reflex action, a rapid, automatic protective response. Heat stimulates pain receptors in the skin; sensory neurons carry the impulse to the spinal cord, where an interneuron connects it to a motor neuron. The motor neuron activates arm muscles before the brain has fully analysed the sensation, so withdrawal is quick. The brain later receives information and becomes aware of pain. The other options deny normal nerve or muscle function.
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What is the correct answer to this question?
Because the spinal cord produces a quick reflex response
Why is this the correct answer?
The governing concept is reflex action, a rapid, automatic protective response. Heat stimulates pain receptors in the skin; sensory neurons carry the impulse to the spinal cord, where an interneuron connects it to a motor neuron. The motor neuron activates arm muscles before the brain has fully analysed the sensation, so withdrawal is quick. The brain later receives information and becomes aware of pain. The other options deny normal nerve or muscle function.
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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