Which statement correctly compares the cardiac cycle with blood flow through the circulation?
Correct answer: A. The cardiac cycle includes atrial and ventricular contraction and relaxation
- A. The cardiac cycle includes atrial and ventricular contraction and relaxation
- B. The cardiac cycle describes only blood movement through capillaries
- C. Systemic circulation occurs only when the ventricles are relaxed
- D. Pulmonary circulation begins when the left atrium contracts
Explanation
The cardiac cycle is the sequence of atrial and ventricular systole and diastole during one heartbeat. Circulation describes the movement of blood through pulmonary and systemic vessels, so it is a broader transport process.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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