Which action is primarily associated with the gastrocnemius when moving the foot?

• A. Plantar flexion
• B. Dorsiflexion
• C. Abduction
• D. Supination

Answer: (A)

Plantar flexion is the action at the ankle produced by the gastrocnemius. This calf muscle crosses the back of the leg and attaches to the heel via the Achilles tendon, so when it contracts it pulls the heel upward and the front of the foot downward, pushing off the ground as you stand, walk, run, or jump. That downward-pointing movement is what you’re testing here. Dorsiflexion is the opposite, lifting the front of the foot toward the shin; abduction would move the foot away from the midline, and supination relates to turning the sole inward, none of which are the primary role of the gastrocnemius.