Scelta multipla
What is the correct order for the components of a reflex arc?
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13. The Peripheral Nervous System
Reflex Arcs
Scelta multipla
How many synapses are involved in the knee-jerk (patellar) reflex arc?
A
Two
B
Four
C
Three
D
One
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Understand the knee-jerk (patellar) reflex arc: It is a simple reflex that involves the contraction of the quadriceps muscle in response to the stretching of the patellar tendon.
Identify the components of the reflex arc: The reflex arc includes a sensory neuron, a motor neuron, and the spinal cord as the integration center.
Recognize that the knee-jerk reflex is a monosynaptic reflex: This means there is only one synapse involved between the sensory neuron and the motor neuron.
Explain the pathway: The sensory neuron detects the stretch in the patellar tendon and sends an impulse to the spinal cord. In the spinal cord, the sensory neuron directly synapses with the motor neuron.
Conclude that the correct answer is 'One' because the knee-jerk reflex arc involves only one synapse between the sensory and motor neurons.
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