The figure below shows the force produced by the biceps muscle during isometric contractions at two different elbow angles, at 20 degrees flexion or at 120 degrees flexion. What better explains the differences in force obtained at these two angles? Sarcomere length Biceps.jpg Group of answer choices At 120 degrees force is maximal because sarcomere length is optimal due to maximal interaction between myosin heads and actin filaments. At 20 degrees force is minimal because sarcomeres are stretched and there is minimal interaction between myosin heads and actin filaments. At 20 degrees force is maximal because sarcomere length is optimal due to maximal interaction between myosin heads and actin filaments. At 120 degrees force is minimal because sarcomeres are stretched and there is minimal interaction between myosin heads and actin filaments