Question

How does the action of the rectus femoris differ from that of the other quadriceps muscle?

A) It only flexes the thigh
B) It only extends the knee
C) It both flexes the thigh and extends the knee
D) It neither flexes the thigh nor extends the knee

Answer 1

The rectus femoris muscle both c. flexes the thigh at the hip joint and extends the leg at the knee joint.

Step-by-step explanation:

The rectus femoris, which is one of the four muscles in the quadriceps femoris group, has a unique function compared to the other muscles in the group. It both c. flexes the thigh and extends the knee.

This muscle originates from the anterior inferior iliac spine and inserts into the patellar tendon. When the rectus femoris contracts, it causes flexion of the thigh at the hip joint and extension of the leg at the knee joint.