Question

multiple choice question
the concentration of calcium in the sarcoplasm ______ during muscle contraction and when relaxation occurs.
remains constant; increases
increases; remains constant
increases; decreases
decreases; increases
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Explanation:

During muscle contraction, calcium ions are released from the sarcoplasmic reticulum into the sarcoplasm, increasing its concentration. When muscle relaxation occurs, calcium ions are actively transported back into the sarcoplasmic reticulum, decreasing the concentration in the sarcoplasm.

Answer:

C. increases; decreases