Which of the following is the most plausible explanation for why an animal cell would be unable to reduce the Ca²⁺ concentration in its cytosol compared with the extracellular fluid?
A) inactivation of calcium-gated ion channels in the cell membrane
B) excessive transport of calcium from the cytosol into the endoplasmic reticulum
C) insufficient ATP levels in the cytosol
D) insufficient levels of protein kinase in the cell

Question

Quizplus · Accepted Answer

ATP is required for the active transport of Ca²⁺ ions out of the cytosol, typically via calcium pumps like the Ca²⁺-ATPase. Insufficient ATP would impair this process, leading to higher cytosolic Ca²⁺ levels.

Which of the Following Is the Most Plausible Explanation for Why