Which best describes a role of L-type Ca²⁺ channels in cardiac muscle cells? A) They function exactly the same in cardiac muscle cells as they do in skeletal muscle. B) They are directly responsible for making cardiac muscle fatigue-resistant. C) They are responsible for preventing tetanic contractions. D) They cause the absolute refractory period to be very brief. E) They act as non-conducting voltage sensors that mediate excitation-contraction coupling.

Question

Quizplus · Accepted Answer

L-type Ca²⁺ channels in cardiac muscle cells are responsible for the plateau phase of the action potential, which helps prevent tetanic contractions by prolonging the refractory period.

Which Best Describes a Role of L-Type Ca2+ Channels in Cardiac

Which Best Describes a Role of L-Type Ca²⁺ Channels in Cardiac