A reflex arc involves
Correct answer: D. Receptor, spinal cord, effector
- A. Only the brain
- B. Only the spinal cord
- C. Spinal cord and brain
- D. Receptor, spinal cord, effector
Explanation
A simple reflex arc involves receptor → sensory neuron → spinal cord integration → motor neuron → effector, without brain involvement.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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