Final answer:
The biceps femoris is part of the hamstring group, which is responsible for knee flexion and hip extension.
Step-by-step explanation:
The muscle group that includes the biceps femoris is the hamstring group.
The hamstrings are located in the posterior compartment of the thigh and consist of three muscles: the biceps femoris, the semitendinosus, and the semimembranosus.
These muscles are primarily responsible for flexing the knee and extending the hip.
The biceps femoris itself has two parts, a long head and a short head, both of which play crucial roles in these movements.