Question

Look carefully at the diagram. What will happen at the knee joint when muscle A contracts? ​

Answer 1

Answer:

knee joint will move in the backward direction and hence the leg could be bent.

Explanation:

I hope this is helpful

Answer 2

Although the knee is a hinge joint, it can also rotate somewhat as it moves. The quadriceps muscles at the front of the thigh straighten the leg, whereas the hamstring muscles in the rear of the thigh (hamstrings) allow the leg to bend at the knee. When you straighten your leg, the quadricep muscles strain on the quadricep tendon, which pulls the kneecap outwards. The hamstring muscles contract when you bend it, pulling the tibia backwards and causing the knee to flex. Certain factors, such as soft-tissue restrictions and muscle tightness, affect the knee's range of motion.