Answer:
Sarcoplasmic reticulum would not be able to concentrate Ca+ back into it.
Step-by-step explanation:
Sarcoplasmic reticulum refers to the smooth endoplasmic reticulum of muscle fiber. The expanded portions of the sarcoplasmic reticulum serve as calcium storage sites. During muscle cessation of muscle contraction, calcium ions are delivered back to the sarcoplasmic reticulum through active transport. The pumping of calcium ions back into sarcoplasmic reticulum uses ATP as energy source. If a cell is not able to form ATP, the sarcoplasmic reticulum would not be able to concentrate the calcium ions back into it.