Cardiac Cycle Worksheet
Explore the phases and components of the human cardiac cycle with this Grade 9 science worksheet.
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Cardiac Cycle Worksheet
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Read each question carefully and answer to the best of your ability. Use the provided diagram to help you with certain questions.
Study the diagram of the human heart below to answer the following questions.
1. Which phase of the cardiac cycle involves the contraction of the ventricles, pumping blood into the arteries?
Atrial systole
Ventricular systole
Diastole
Cardiac diastole
2. During which period are all four heart valves closed and ventricular pressure is building?
Ventricular ejection
Diastasis
Isovolumetric contraction
Isovolumetric relaxation
3. The 'lub-dub' sound of the heart is caused by the closing of the heart .
4. The period of ventricular relaxation and filling is called .
5. The sinoatrial (SA) node is known as the natural pacemaker of the heart.
True
False
6. Diastole is generally a shorter phase than systole in a healthy heart.
True
False
7. Briefly describe the main events that occur during atrial systole.
8. Explain the role of the atrioventricular (AV) valves during the cardiac cycle.
Match each term on the left with its definition on the right.
9. Systole
a. Relaxation phase of the cardiac cycle
10. Diastole
b. Contraction phase of the cardiac cycle
11. Cardiac Output
c. Volume of blood pumped by the heart per minute
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