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Questions and Answers
Which channel is enriched in the junctional regions of the SR in cardiac muscle sarcomeres?
Which channel is enriched in the junctional regions of the SR in cardiac muscle sarcomeres?
- Ryanodine receptors (correct)
- Na+ - Ca2+ antiporter
- Sarcolemmal Ca2+ pump
- Sarcoplasmic endoplasmic reticulum calcium-ATPase
What initiates the cross-bridge cycle in cardiac muscle?
What initiates the cross-bridge cycle in cardiac muscle?
- Binding of troponin C to Ca2+ (correct)
- Extrusion of Ca2+ from the cell
- Influx of Ca2+ during an action potential
- Ca2+ release from the SR
How is Ca2+ extruded from cardiac muscle cells?
How is Ca2+ extruded from cardiac muscle cells?
- By influx of Ca2+ during an action potential
- Through the sarcolemmal Na+ - Ca2+ antiporter and sarcolemmal Ca2+ pump (correct)
- Through the sarcoplasmic endoplasmic reticulum calcium-ATPase (SERCA)
- By binding to troponin C
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