Rectus femoris has which primary action?

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Prepare for the NHI Eastern Kinesiology Test with our comprehensive quiz. Utilize flashcards and multiple-choice questions, complete with hints and detailed explanations. Ready yourself for success!

Multiple Choice

Rectus femoris has which primary action?

Explanation:
Rectus femoris is a two‑joint muscle that crosses both the hip and the knee. Its contraction straightens the knee (knee extension), and because it crosses the front of the hip, it also helps bring the thigh toward the trunk (hip flexion). It does not perform hip abduction or lateral rotation, and it’s not involved in ankle dorsiflexion. So the primary actions are extending the knee and flexing the hip.

Rectus femoris is a two‑joint muscle that crosses both the hip and the knee. Its contraction straightens the knee (knee extension), and because it crosses the front of the hip, it also helps bring the thigh toward the trunk (hip flexion). It does not perform hip abduction or lateral rotation, and it’s not involved in ankle dorsiflexion. So the primary actions are extending the knee and flexing the hip.

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