Final answer:Inknee flexion, the effort comes from the contraction of the hamstring muscle group. These muscles work against the resistance, which is the weight of the lower leg and foot, to pull the tibia closer to the femur, resulting in knee flexion.Explanation:During knee flexion, the effort comes from the contraction of thehamstring musclegroup. The hamstring muscles are located at the back of the thigh and are responsible for flexing or bending the knee. They work against the resistance, which is the weight of the lower leg and foot. So, when you bend your knee, your hamstrings contract and pull the tibia (lower leg bone) closer to thefemur(upper leg bone), essentially creating knee flexion.In conclusion, during knee flexion, the effort is the work done by the contraction of the hamstring muscle group against the weight of the lower leg and foot.Learn more aboutknee flexionhere:brainly.com/question/33378136#SPJ11...

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