The concentration of calcium in a cell is 3%. The concentration of calcium in the surrounding fluid is 1%. Which of the following processes could the cell use to obtain more calcium?
A) passive transport
B) diffusion
C) active transport
D) osmosis
E) pinocytosis

Question

Quizplus · Accepted Answer

Active transport is the correct answer because it allows cells to move substances against their concentration gradient, from areas of low concentration to areas of high concentration, which requires energy. In this case, since the concentration of calcium inside the cell is higher than in the surrounding fluid, active transport would be necessary to bring more calcium into the cell.

The Concentration of Calcium in a Cell Is 3