The return of calcium ions to the sarcoplasmic reticulum during muscle relaxation decreases the calcium ion concentration in the cytosol.

Question

Quizplus · Accepted Answer

When calcium ions are returned to the sarcoplasmic reticulum during muscle relaxation, the calcium ion concentration in the cytosol decreases. This is because the sarcoplasmic reticulum serves as a storage site for calcium ions in muscle cells, and when muscle stimulation ceases, the calcium ions are actively transported back into the sarcoplasmic reticulum to be stored until the next contraction.

The Return of Calcium Ions to the Sarcoplasmic Reticulum During