Final answer:
The statement about hamstrings being two-joint muscles that act at the knee and ankle is false; they act at the hip and knee, not the ankle.
Step-by-step explanation:
The statement that the hamstrings muscles are two-joint muscles that act at the knee and ankle is false. The hamstrings are a group of three muscles located at the back of the thigh, namely the biceps femoris, semitendinosus, and semimembranosus. These muscles primarily act on two joints: the hip and the knee. At the hip, they help with extension, while at the knee, they are responsible for flexion. They do not act directly on the ankle joint. Muscles work in pairs, for instance, when the hamstrings flex the knee, the quadriceps femoris muscles located at the front of the thigh are the antagonists, working to extend the knee.