L-Type Calcium Channels in Cardiac Muscle Cells

Multiple Choice

L-type calcium channels in cardiac muscle cells

A) Are essentially present and the same in both skeletal and cardiac muscle
B) Are directly related to making them fatigue resistant
C) Are responsible for preventing tetanic contractions in them
D) Cause the absolute refractory period to be very short lived
E) Provide the mechanism necessary for producing contractions of varying intensity or force