Question

Polysynaptic reflexes can produce far more complicated responses than can monosynaptic reflexes because
(a) The response time is quicker.
(b) The response is initiated by highly sensitive receptors.
(c) Motor neurons carry impulses at a faster rate than do sensory neurons.
(d) The interneurons involved can control several muscle groups.

Accepted Answer

Step 1: Understand the difference between monosynaptic and polysynaptic reflexes. Monosynaptic reflexes involve a single synapse between a sensory neuron and a motor neuron, leading to a simple and quick response. Step 2: Recognize that polysynaptic reflexes involve one or more interneurons between the sensory and motor neurons, allowing for more complex processing and integration of information. Step 3: Consider how the presence of interneurons in polysynaptic reflexes enables coordination of multiple muscle groups, which can produce more complicated responses compared to the direct pathway in monosynaptic reflexes. Step 4: Evaluate each option in the problem: (a) response time is quicker - this is generally false for polysynaptic reflexes because additional synapses slow the response; (b) response initiated by highly sensitive receptors - this is not the main reason for complexity; (c) motor neurons carry impulses faster than sensory neurons - this is unrelated to complexity; (d) interneurons can control several muscle groups - this explains the ability to produce more complicated responses. Step 5: Conclude that the correct explanation is that interneurons involved in polysynaptic reflexes can control several muscle groups, allowing for more complex and coordinated responses.

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Concetti chiave

Polysynaptic Reflexes

Monosynaptic Reflexes

Role of Interneurons in Reflex Arcs