Which of the Following Is the CORRECT Order of Events

question 146

Multiple Choice

Which of the following is the CORRECT order of events in the control of the heartbeat?
1) activation of the SA node
2) contraction of the atria
3) contraction of the ventricles
4) activation of the AV node
5) transmission of the action potential through a set of modified conducting muscle fibers

• A)1, 2, 4, 5, 3
• B)1, 4, 2, 5, 3
• C)1, 3, 4, 2, 5
• D)1, 5, 4, 2, 3
• E)1, 2, 5, 4, 3

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