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Questions and Answers
What triggers the release of Ca2+ from the Sarcoplasmic reticulum (SR)?
What triggers the release of Ca2+ from the Sarcoplasmic reticulum (SR)?
- Diffusion of Na+ into the cell
- Binding of Ca2+ to troponin
- Opening of voltage-gated Ca2+ channels on the plasma membrane (correct)
- Opening of voltage-gated K+ channels
What is the role of Ca2+ in muscle contraction?
What is the role of Ca2+ in muscle contraction?
- Open voltage-gated K+ channels
- Bind to troponin to stimulate contraction (correct)
- Inhibit the binding of troponin to actin
- Stimulate the contraction of myofibrils
What is the primary function of voltage-gated Ca2+ channels on the plasma membrane?
What is the primary function of voltage-gated Ca2+ channels on the plasma membrane?
- Regulate the release of Ca2+ from the Sarcoplasmic reticulum
- Allow Ca2+ to diffuse into the cell and stimulate the opening of calcium release channels (correct)
- Stimulate the release of Na+ from the Sarcoplasmic reticulum
- Inhibit the contraction of myofibrils
What is the source of Ca2+ that binds to troponin?
What is the source of Ca2+ that binds to troponin?
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What is the direct result of the opening of voltage-gated Ca2+ channels on the plasma membrane?
What is the direct result of the opening of voltage-gated Ca2+ channels on the plasma membrane?
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