When calcium becomes available inside a cell, it comes from
A) extracellular fluid only.
B) intracellular storage only.
C) extracellular fluid and intracellular storage.
D) It is always available as a major cytosol cation.

Question

Quizplus · Accepted Answer

Calcium can come from both extracellular fluid and intracellular storage such as the endoplasmic reticulum and mitochondria. It is not always available as a major cytosol cation.

When Calcium Becomes Available Inside a Cell, It Comes from