Which muscle is a hip flexor and also a knee extensor?

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Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

Which muscle is a hip flexor and also a knee extensor?

Explanation:
Two-joint muscles can produce different actions at each joint they cross. Rectus femoris crosses both the hip and the knee, so it can flex the hip while straightening the knee. That combination—hip flexion with knee extension—is what this muscle does, and it’s a primary action of the rectus femoris, part of the quadriceps. The other muscles don’t combine those two actions: biceps femoris extends the hip and flexes the knee; sartorius and gracilis mainly assist hip flexion or knee flexion in other patterns. So the muscle that is both a hip flexor and a knee extensor is rectus femoris.

Two-joint muscles can produce different actions at each joint they cross. Rectus femoris crosses both the hip and the knee, so it can flex the hip while straightening the knee. That combination—hip flexion with knee extension—is what this muscle does, and it’s a primary action of the rectus femoris, part of the quadriceps. The other muscles don’t combine those two actions: biceps femoris extends the hip and flexes the knee; sartorius and gracilis mainly assist hip flexion or knee flexion in other patterns. So the muscle that is both a hip flexor and a knee extensor is rectus femoris.

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