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Sarcomeres and Calcium Signaling

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Questions and Answers

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?

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?

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

Sarcomeres and Calcium Signaling

Choose a study mode

Podcast

Questions and Answers

Which channel is enriched in the junctional regions of the SR in cardiac muscle sarcomeres?

What initiates the cross-bridge cycle in cardiac muscle?

How is Ca2+ extruded from cardiac muscle cells?

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