Which muscle is described as the kicking muscle due to extending the leg and flexing the thigh?

• A. Rectus Femoris
• B. Biceps Femoris
• C. Gastrocnemius
• D. Vastus Lateralis

Answer: (A)

Kicking relies on bringing the thigh forward (hip flexion) while straightening the knee (knee extension). The rectus femoris is the one that can do both actions because it crosses both the hip and knee joints. When it contracts, it helps lift the thigh at the hip and simultaneously extends the knee to push the lower leg forward, making it the kicking muscle most suited to describe that movement. The other muscles have more limited roles for this action: one mainly extends the knee, another plantarflexes the ankle (with a minor knee flexion contribution), and the hamstrings primarily extend the hip and flex the knee, which moves the thigh backward rather than forward for a kick.