I think the correct answer from the choices listed above is the first option. If you want to improve your muscular strength, then the best plan would be to make low resistance with high reps. Hope this answers the question.
ATP-driven pumps will move Ca ++<span> out of the sarcoplasm back into the SR. This results in the “reshielding” of the </span>actin<span>-binding sites on the thin filaments. Without the ability to form cross-bridges between the thin and thick filaments, the </span>muscle<span>fiber loses its tension and relaxes.</span>
The answer is the first one, A!
I believe the answer would be d.muscle cramps. Breathing in toxins seems like it could relate to the other three answers.
