The correct sequence of components in a spinal reflex arc is
Correct answer: C. receptor, sensory neurone, interneurone in the spinal cord, motor neurone, effector
- A. effector, motor neurone, spinal cord, sensory neurone, receptor
- B. receptor, motor neurone, spinal cord, sensory neurone, effector
- C. receptor, sensory neurone, interneurone in the spinal cord, motor neurone, effector
- D. sensory neurone, receptor, effector, motor neurone, spinal cord
Explanation
The stimulus is detected by the receptor, carried into the spinal cord by the sensory neurone through the dorsal root, passed to a relay neurone and then out along the motor neurone through the ventral root to the muscle or gland that responds. Sensory always means towards the central nervous system and motor always means away from it, which is enough to rule out the reversed options.
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About Reflexes and the Reflex Arc
A reflex arc shows how a rapid, automatic response travels from a receptor through a sensory neuron, relay neuron and motor neuron to an effector. The topic covers synapses, the spinal cord's role, and the difference between an involuntary reflex action and a slower voluntary response.
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