A person pulls the hand away immediately after touching a hot vessel. Which control centre acts first in this action?
Answer and explanation
Correct answer: Spinal cord
This is a reflex action, so the body responds through a reflex arc before conscious brain processing is completed. Heat receptors send an impulse through a sensory neuron to the spinal cord, where an immediate motor response is organised. The hand is then withdrawn through a motor neuron. The brain receives information too, but it does not act as the first centre; the heart and pancreas are not centres for this response.
Frequently asked questions
What is the correct answer to this question?
Spinal cord
Why is this the correct answer?
This is a reflex action, so the body responds through a reflex arc before conscious brain processing is completed. Heat receptors send an impulse through a sensory neuron to the spinal cord, where an immediate motor response is organised. The hand is then withdrawn through a motor neuron. The brain receives information too, but it does not act as the first centre; the heart and pancreas are not centres for this response.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Reflex action.
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