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Assertion: The knee-jerk reflex is an example of a monosynaptic reflex.

Reason: In the knee-jerk reflex, the sensory neuron directly synapses with the motor neuron in the spinal cord without the involvement of an interneuron.

 

Option: 1

Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.


Option: 2

Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.


Option: 3

Assertion is true, but the Reason is false.

 


Option: 4

Assertion is false, but the Reason is true.

 


Answers (1)

best_answer

A tap on the patellar tendon causes the quadriceps muscle to contract in a basic reflex known as the knee-jerk reaction. The muscular spindle in the quadriceps muscle serves as the reflex' sensory receptor by detecting variations in muscle length. A touch on the patellar tendon causes the muscle spindle to stretch, which causes a sensory neuron to send a message to the spinal cord. Without the assistance of an interneuron, a monosynaptic reflex occurs when a sensory neuron in the spinal cord synapses directly with a motor neuron. In the knee-jerk response, the quadriceps muscle contracts as a result of a direct connections between the sensory and motor neurons. Therefore, the assertion is true, and the reason is a correct explanation for it.

Option a is the correct answer.

 

Posted by

Sanket Gandhi

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