Which ions exchange places to cause Ca2+ release from the sarcoplasmic reticulum?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

Which ions exchange places to cause Ca2+ release from the sarcoplasmic reticulum?

Explanation:
The main idea is that Ca2+ release from the sarcoplasmic reticulum is driven by the electrical signal that travels along the muscle membrane. When a motor neuron stimulates a muscle fiber, Na+ rushes into the cell to depolarize the membrane, and then K+ exits as the membrane repolarizes. This rapid exchange of Na+ inward and K+ outward creates an action potential that travels into the T-t tubules and triggers the channels on the sarcoplasmic reticulum to open, releasing Ca2+ into the cytosol. The other ion pairs listed don’t generate this depolarization in the muscle context, so they don’t drive Ca2+ release from the SR.

The main idea is that Ca2+ release from the sarcoplasmic reticulum is driven by the electrical signal that travels along the muscle membrane. When a motor neuron stimulates a muscle fiber, Na+ rushes into the cell to depolarize the membrane, and then K+ exits as the membrane repolarizes. This rapid exchange of Na+ inward and K+ outward creates an action potential that travels into the T-t tubules and triggers the channels on the sarcoplasmic reticulum to open, releasing Ca2+ into the cytosol. The other ion pairs listed don’t generate this depolarization in the muscle context, so they don’t drive Ca2+ release from the SR.

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