MEDICAL PHYSIOLOGY

Detailed explanation-1: -Movement = starts off with knee flexion which is bending your knees. Hamstrings contract being your agonist, and your quadriceps relax being the antagonist.

Detailed explanation-2: -These results suggest that the activation level of an agonist (quadriceps femoris) muscle and the co-activation level of an antagonist (biceps femoris) muscle were higher in longer muscles than in shorter muscles.

Detailed explanation-3: -The biceps femoris is responsible for movement at both the hip joint and knee joint. At the hip, the long head of the biceps femoris allows for thigh extension and external rotation. Whereas at the knee, the biceps femoris allows for knee flexion and lower leg external rotation.

Detailed explanation-4: -The one agonist muscle that extends the knee is the massive quadriceps. Knee extension ROM is from full flexion to 5-10° hyperextension. The iliotibial tract (ITB) and tensor fascia latae (TFL) also play a role in knee extension.