A Nursing Instructor Is Explaining the Role of Calcium in the Contraction

A nursing instructor is explaining the role of calcium in the contraction of the cardiac muscle.The instructor asks the students to state,in order,the events that allow the cardiac muscle to contract.
Standard Text: Click on the down arrow for each response in the right column and select the correct choice from the list.
Response
A)An action potential occurs.
Response
B)Depolarization occurs.
Response
C)Voltage-gated channels in the sarcolemma open.
Response
D)Ions enter and leave the muscle cell.
Response
E)Muscle contraction occurs.