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; contract
B. relax; relax
C. relax; contract
D. contract; relax
Answer: D
Anatomy & Physiology
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