A unipennate muscle has a cross-sectional area of 10 cm2 and another cross-sectional area of 11 cm2. The angle of pennation for both cross-sectional areas is 30°. This muscle can produce a maximal isometric contraction force of 500 N. What is the stress during the maximal isometric contraction?

an obstruction

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the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.