If a student quickly removes the hand from a hot vessel what is the correct sequence of this action?
Answer and explanation
Correct answer: Receptor to sensory nerve to spinal cord to motor nerve to muscle
Withdrawal of the hand from a hot vessel is a reflex action. Heat receptors in the skin detect the stimulus, and the impulse travels through a sensory neuron to the spinal cord. The spinal cord sends a command through a motor neuron to the arm muscle, which contracts and pulls the hand away. Thus option A gives the correct reflex arc sequence; the other sequences reverse or omit essential steps.
Frequently asked questions
What is the correct answer to this question?
Receptor to sensory nerve to spinal cord to motor nerve to muscle
Why is this the correct answer?
Withdrawal of the hand from a hot vessel is a reflex action. Heat receptors in the skin detect the stimulus, and the impulse travels through a sensory neuron to the spinal cord. The spinal cord sends a command through a motor neuron to the arm muscle, which contracts and pulls the hand away. Thus option A gives the correct reflex arc sequence; the other sequences reverse or omit essential steps.
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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