The muscles in the leg are considered long muscles. as the muscles in the leg contract and relax they work to provide movement. what would happen if the upper leg muscles were damaged?
your femur and hamstrings would not be held in place.
you would be able to move your knee to flex and extend your leg.
you would not be able to extend the leg straight.
your hipbone will be dislocated causing a deformity in your side.

You would not be able to extend the leg straight

The hamstrings start at the pelvis and end in the lower leg so they wouldn't be affected.

If the muscles are damaged movement is not possible.

The Hip bone is more attached to the pelvis and bone rather than upper leg muscles.

If the upper muscles are damages, movement would be extremely painful or impossible if we assume the sliding filament theory is correct making that the correct answer.

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explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

a symbiotic relationship with the mitochondria