★ Muscles and Movements Quiz
When a muscle contracts
A. both actin and myosin become shorter in length
B. myosin heads pull the actin towards the M line
C. actin heads pull myosin towards H line
D. the sarcomere length increases
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What two chemicals are necessary for muscle contraction to occur?
A. Niacin and Potassium
B. Calcium and ATP
C. Sodium and Potassium
D. Ach and Potassium
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