The three factors that describe the force vector of a muscle are the
a. attachment site of the muscle, the line of muscular pull, and the fibers active during the contraction.
b. attachment site of the muscle, the line of muscular pull, and the strength of the moving bone.
c. attachment site of the muscle, the line of muscular pull, and the strength of the contraction.
d. attachment site of the muscle, the line of counter pull, and the velocity of the contraction.
c
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