The rectus femoris muscle originates on the anterior aspect of iliac spine and inserts onto the tibial tuberosity. What joint action(s) does it produce when it contracts concentrically?
A. Flexion at the knee and flexion at the hip
B. Extension at the knee and extension at the hip
C. Flexion at the knee and extension at the hip
D. Extension at the knee and flexion at the hip
Answer: D
A. Flexion at the knee and flexion at the hip
B. Extension at the knee and extension at the hip
C. Flexion at the knee and extension at the hip
D. Extension at the knee and flexion at the hip
Answer: D