Question

in an isotonic contraction, the muscle ________. does not change in length but increases tension never converts pyruvate to lactate rapidly resynthesizes creatine phosphate and atp changes in length and moves the \load\

Explanation:

Isotonic contractions involve muscle length change to move a load. Isometric contractions (not isotonic) have no length change but tension increase. Pyruvate - lactate conversion (glycolysis) can occur in muscle metabolism regardless. Creatine phosphate and ATP resynthesis is part of energy supply but not specific to isotonic contraction's defining feature.

Answer:

changes in length and moves the "load"