The statements about transport of Ca²⁺ from the cytosol (low Ca²⁺ concentration) into the endoplasmic reticulum (high Ca²⁺ concentration) are true EXCEPT which of the following?

Question

Quizplus · Accepted Answer

Calcium transport into the endoplasmic reticulum (ER) from the cytosol, where the ER has a higher calcium concentration, involves active transport rather than facilitated diffusion. This process requires energy (usually in the form of ATP) to move calcium ions against their concentration gradient, which is achieved through the use of a calcium pump (a type of transmembrane protein). Thus, facilitated diffusion, which does not require energy and moves substances down their concentration gradient, is not the mechanism for calcium transport into the ER.

The Statements About Transport of Ca2+ from the Cytosol (Low

The Statements About Transport of Ca²⁺ from the Cytosol (Low