1) 1. What role does ATP play in muscle contraction? a) It helps myosin detach from actin for muscle contraction. b) It helps the muscle relax after contraction. c) It stores energy for long-term muscle use. d) It directly causes muscle growth. 2) What happens when lactic acid builds up in muscles during exercise? a) It makes muscles stronger. b) It decreases pH, leading to fatigue. c) It helps muscles recover faster. d) It prevents muscle soreness. 3) How do reactive oxygen species (ROS) affect muscles during exercise? a) They increase muscle strength. b) They cause cell damage and contribute to fatigue. c) They speed up ATP production. d) They help muscles relax after exercise. 4) How does potassium buildup inside muscle cells affect fatigue? a) It helps muscles contract more strongly. b) It disrupts muscle function, causing fatigue. c) It improves muscle recovery. d) It has no effect on fatigue. 5) What role do calcium ions play in muscle contraction? a) They help muscles contract by interacting with actin and myosin. b) They help muscles relax by blocking contraction. c) They help muscles grow larger. d) They store energy for later use.

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