Cardiac Cycle Worksheet
A Grade 10 Science worksheet focusing on the cardiac cycle, including the stages of systole and diastole, and the role of the heart chambers and valves.
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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 understand the structures of the heart.
Observe the diagram of the human heart below before answering the questions.
1. Which phase of the cardiac cycle involves the contraction of the ventricles?
Atrial systole
Ventricular systole
Diastole
Cardiac rest
2. What is the primary function of the atrioventricular (AV) valves during the cardiac cycle?
To prevent backflow of blood into the atria
To regulate blood pressure in the arteries
To pump blood into the pulmonary artery
To initiate the electrical impulse for contraction
3. The relaxation phase of the cardiac cycle, where the heart chambers fill with blood, is called .
4. The valve prevents blood from flowing back into the left ventricle from the aorta.
5. During ventricular systole, both the atrioventricular and semilunar valves are open.
True
False
6. Briefly explain the difference between atrial systole and ventricular systole.