3 Questions
Which channel is enriched in the junctional regions of the SR in cardiac muscle sarcomeres?
Ryanodine receptors
What initiates the cross-bridge cycle in cardiac muscle?
Binding of troponin C to Ca2+
How is Ca2+ extruded from cardiac muscle cells?
Through the sarcolemmal Na+ - Ca2+ antiporter and sarcolemmal Ca2+ pump
Test your knowledge on cardiac muscle sarcomeres and calcium signaling in this quiz. Learn about the role of ryanodine receptors (RYRs) and how calcium release from the sarcoplasmic reticulum (SR) is initiated.
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