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Pathway of Reflex Arc is A) Heat/pain receptors-sensory neuron-relay neuron- motor neuron-effector B) Sensory neuron-receptors-relay neuron-Motor neuron-effector C) Thermo/pain receptors-sensory neuron-relay neuron-motor neuron-muscle in arm D) More than 1 option is correct |
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Answer» Answer: When a receptor is stimulated, it sends a signal to the central nervous system, where the brain coordinates the response. But sometimes a very quick response is needed, one that does not need the involvement of the brain. This is called as the reflex action. In a simple reflex action: STIMULUS -> Receptor -> Sensory NEURON -> Relay Neuron -> Motor neuron -> EFFECTOR (Muscle). So, the correct answer is 'Receptors - Sensory neuron - Spinal cord - Motor neuron - Muscle' |
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