Question

during muscle relaxation, calcium levels in the sarcoplasm fall because ________. calcium is actively transported into the extracellular space calcium diffuses into the extracellular space calcium diffuses into the sarcoplasmic reticulum calcium is actively transported into the sarcoplasmic reticulum need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill. all rights reserved.

Explanation:

During muscle relaxation, calcium - ATPase pumps actively transport calcium ions from the sarcoplasm back into the sarcoplasmic reticulum. This is an energy - dependent process (using ATP) rather than a simple diffusion process. The sarcoplasmic reticulum is the storage site for calcium in muscle cells.

Answer:

calcium is actively transported into the sarcoplasmic reticulum