Question 3 (1 point) An increase in the concentration of free calcium ions (Ca+)

Question

Question 3 (1 point) An increase in the concentration of free calcium ions (Ca+) in the cytosol is a second messenger that is used in signaling pathways. In the absence of a signal, cytosolic calcium ion (Ca ") levels are kept low by which of the following mechanisms? (Select ALL that are TRUE.) a) Ca is actively transported through nuclear pores into the nucleus b) Pumps in the membrane of the ER move Ca into the endoplasmic reticulum, up its concentration gradient. c) Pumps in the mitochondrial membrane move Catt into the mitochondria, up its concentration gradient. d) Pumps in the plasma membrane move Ca out of the cell. e) Calcium-binding proteins bind free Ca in the cytosol

Explanation / Answer

An increase in the concentration of free calcium ions (ca++) in the cytosol is a second messenger that is used in the signaling pathways. In the absence of signal, cytosolic calcium ion (ca++) levels are kept low by which of the following mechanism?

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