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

question 38

Multiple Choice

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.