When the hip is fully flexed the rectus femoris is ____ likely to work during knee extension.

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When the hip is fully flexed, the rectus femoris, which is a two-joint muscle (crossing both the hip and knee), is already shortened at the hip joint. This position makes it less effective in generating force for knee extension because muscles cannot produce maximal force when they are significantly shortened or lengthened from their optimal length.

When the Hip Is Fully Flexed the Rectus Femoris Is