Question

If the cell could no longer produce ATP, what would be the effect on the sarcoplasmic reticulum? If the cell could no longer produce ATP, what would be the effect on the sarcoplasmic reticulum?

A. The muscle would not contract.
B. It would be unable to concentrate Ca+ in the sarcoplasmic reticulum.
C. Ca+ would leak out of the cell.
D. Ca+ would build up in the sarcoplasmic reticulum.

Answer 1

Answer:

A. The muscle would not contract.

Explanation:

The sarcoplasmic reticulum is a specialized smooth endoplasmic reticulum that transmits electrical impulses and is the primary regulator of calcium storage, release, and reuptake. On the other hand, glycolysis and the mitochondria are responsible for cellular ATP production.

In the muscle, the SR and mitochondrial function are interconnected, ATP is used to lower myoplasmic calcium levels during muscle relaxation, this means that muscle contractility is linked to the control of sarcomeric Ca2+ delivery/removal and ATP generation/utilization. If we have a failure to remove Ca2+ from the cytosol by not producing ATP, the muscle will be prevented from relaxation, subsequently there will be a decrease in muscle contraction too.

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