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 1. An action potential occurs.
Response 2. Depolarization occurs.
Response 3. Voltage-gated channels in the sarcolemma open.
Response 4. Ions enter and leave the muscle cell.
Response 5. Muscle contraction occurs.
Correct Answer: 1,2,3,4,5
Rationale 1: An action potential is the first step that must occur for the cardiac muscle to contract.
Rationale 2: Depolarization is the second step that must occur for the cardiac muscle to contract.
Rationale 3: The third step that occurs in the contraction of the cardiac muscle is the opening of the voltage-gated channels in the sarcolemma.
Rationale 4: The fourth step that occurs in the contraction of the cardiac muscle is ions entering and leaving the muscle cell.
Rationale 5: The last step that occurs is the actual contraction of the cardiac muscle.
Global Rationale: An action potential is the first step that must occur for the cardiac muscle to contract. Depolarization is the second step that must occur for the cardiac muscle to contract. The third step that occurs in the contraction of the cardiac muscle is the opening of the voltage-gated channels in the sarcolemma. The fourth step that occurs in the contraction of the cardiac muscle is ions entering and leaving the muscle cell. The last step that occurs is the actual contraction of the cardiac muscle.
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