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The concentration of free Ca2+ in the cytosol of an unstimulated cell is kept low compared with its concentration in both the extracellular fluid and the endoplasmic reticulum. Which of the following help to maintain this difference?Ca2+ pumps in the plasma membrane and the ER membrane

Respuesta :

Sarco/Endoplasmic Reticulum Calcium ATPases (SERCA enzymes) provide an active, ATP-dependent gradient of several thousand-fold calcium ion concentration between the cytosol (low nanomolar) and the ER lumen.

CA is released from the endoplasmic reticulum in what way?

In response to a range of signals, including neurotransmitters and neurotrophic factors, calcium is released from the endoplasmic reticulum (ER) in neurons (Rizzuto 2001). Inositol trisphosphate (IP3) receptors and ryanodine receptors are two separate types of ER calcium channels that mediate calcium release.

Which of the following best describes how cellular compartmentalization enhances process efficiency?

A high surface-area-to-volume ratio is the outcome of compartmentalization within a cell.

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