Low levels of calcium within cells are maintained by
A) a high number of voltage-gated and leakage channels for calcium in cell membranes.
B) frequent exocytosis and endocytosis of calcium-containing vesicles.
C) pumps that move calcium out of cells or into the sarcoplasmic reticulum.
D) osmosis of large amounts of water into cells that have any calcium within them.

Question

Quizplus · Accepted Answer

Cells maintain low levels of calcium by using pumps, such as the calcium ATPase, to actively transport calcium out of the cell or into the sarcoplasmic reticulum, rather than relying on channels or osmosis.

Low Levels of Calcium Within Cells Are Maintained by