In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh.This reflex will cause the quadriceps femoris to
A)contract and the antagonist muscles, the hamstrings, to relax.
B)contract and the hamstrings also to contract.
C)relax and the hamstrings to contract.
D)relax and the hamstrings also to relax.
E)relax without any effect on the hamstrings.

Question

Quizplus · Accepted Answer

The patellar tendon reflex is a monosynaptic reflex arc that causes the quadriceps femoris to contract, leading to knee extension. Simultaneously, the antagonist muscles, the hamstrings, are inhibited and relax, allowing the reflex action to occur smoothly.

In the Patellar Tendon Reflex Arc, the Patellar Ligament Is