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A reflex action refers to a quick, automatic, and involuntary reaction to a stimulus, mediated by nerves and occurring without conscious control. If the reflex arc involves just two neurons—a sensory neuron and a motor neuron—it is termed monosynaptic.

1. a) Monosynaptic reflex involves only two neurons, one sensory and one motor.
2. b) Reflex actions are voluntary and involve multiple neurons.
3. c) Monosynaptic reflex requires three or more neurons.
4. d) Reflex actions are conscious responses to stimuli.

Correct answer: a) Monosynaptic reflex involves only two neurons, one sensory and one motor.

Solution

A monosynaptic reflex is defined by a single synapse in the reflex arc, which means only two neurons are involved: a sensory neuron and a motor neuron. That matches option A exactly.

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