Cardiac Cycle Worksheet
A Grade 11 science worksheet focusing on the phases and regulation of the cardiac cycle.
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Cardiac Cycle Worksheet
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Read each question carefully and answer to the best of your ability. Refer to your notes and textbook if needed.
1. The cardiac cycle consists of two main phases: (contraction) and (relaxation).
2. The 'lub' sound of the heartbeat is caused by the closing of the and valves.
3. The 'dub' sound is caused by the closing of the and valves.
4. Blood flows from the atria to the ventricles when the valves open.
5. Which of the following events occurs during ventricular systole?
Atrial contraction
Ventricular relaxation
Ejection of blood into the aorta and pulmonary artery
Filling of the atria
6. The pacemaker of the heart is primarily the:
Atrioventricular (AV) node
Purkinje fibers
Sinoatrial (SA) node
Bundle of His
7. Diastole is the phase of ventricular contraction.
True
False
8. The cardiac output is the amount of blood pumped by each ventricle per minute.
True
False
9. Briefly describe the role of the atrioventricular (AV) node in the cardiac cycle.
10. Explain the difference between stroke volume and cardiac output.
11. Examine the diagram of the human heart below and label the following parts: Right Atrium, Left Ventricle, Aorta, Pulmonary Artery, Superior Vena Cava.
Use the words below to complete the sentences.
12. During , the heart chambers relax and fill with blood.
13. The valves prevent backflow of blood into the during ventricular contraction.