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 ________ and the hamstrings to ________.
A) contract; relax
B) contract; contract
C) relax; contract
D) relax; relax

Question

Quizplus · Accepted Answer

The patellar tendon reflex arc is a stretch reflex that causes the quadriceps femoris muscle to contract in response to being stretched, while simultaneously causing the antagonistic muscles, the hamstrings, to relax. This coordinated response allows for the leg to kick forward without resistance from the hamstrings.

In the Patellar Tendon Reflex Arc, the Patellar Ligament Is