QuestionAugust 11, 2025

Which of the following is NOT required for a reflex arc? interneurons sensory neurons receptors motor neurons

Which of the following is NOT required for a reflex arc? interneurons sensory neurons receptors motor neurons
Which of the following is NOT required for a reflex arc?
interneurons
sensory neurons
receptors
motor neurons

Solution
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Answer

interneurons Explanation 1. Identify components of a reflex arc A reflex arc typically includes receptors, sensory neurons, interneurons, motor neurons, and effectors. 2. Determine the non-essential component Interneurons are not always required in simple reflex arcs, such as the monosynaptic reflex arc (e.g., knee-jerk reflex), where the sensory neuron directly communicates with the motor neuron.

Explanation

1. Identify components of a reflex arc<br /> A reflex arc typically includes receptors, sensory neurons, interneurons, motor neurons, and effectors.<br /><br />2. Determine the non-essential component<br /> Interneurons are not always required in simple reflex arcs, such as the monosynaptic reflex arc (e.g., knee-jerk reflex), where the sensory neuron directly communicates with the motor neuron.
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