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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.

Related tags

Reflex ActionReflex ArcSensory NerveMotor NerveControl And CoordinationScienceClass 10 Mcq

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