Consider what occurs when calcium is present inside a sarcomere. Based on this knowledge, predict what the result would be If calcium entered a sarcomere, but where UNABLE to leave the
sarcomere.

Since calcium is an ion that allows the contraction of the sarcomere, if the calcium does not leave the sarcomere the muscle contraction is maintained and the sarcomere is unable to relax.

Explanation:

Calcium (Ca²⁺) is necessary for muscle contraction to occur. Once the muscle fiber receives the signal that starts the contraction, cytoplasmic Ca²⁺ levels increase —by intracellular Ca²⁺ release and extracellular Ca²⁺ input—causing muscle contraction.

If for some circumstance the cytoplasmic Ca²⁺ levels do not decrease, muscle contraction would be maintained with no possibility of relaxation. This is a brief summary of the process by which Ca promotes muscle contraction:

The Ca²⁺ pumps of the sarcoplasmic reticulum and the Na⁺/Ca²⁺ exchanger decrease the levels of intracellular Ca, by storing it again in the reticulum or taking it to the extracellular space, respectively.  This decreases intracellular Ca²⁺  concentrations.

If this process does not occur properly, Ca²⁺ levels remain elevated and muscle contraction is maintained, without relaxation occurring.

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