Cardiac Cycle Worksheet
A Grade 12 Science worksheet on the cardiac cycle, covering the phases, pressure changes, and electrical events.
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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 knowledge of the human cardiac cycle.
1. Which phase of the cardiac cycle involves the contraction of the ventricles and ejection of blood into the aorta and pulmonary artery?
Atrial systole
Ventricular diastole
Ventricular systole
Isovolumetric relaxation
2. The 'lub' sound of the heart is caused by the closing of which valves?
Aortic and pulmonary valves
Mitral and tricuspid valves
Tricuspid and pulmonary valves
Mitral and aortic valves
3. The SA node is often referred to as the heart's natural .
4. During ventricular , the ventricles relax and fill with blood.
5. Briefly describe the role of the AV node in the cardiac cycle.
6. Label the following parts of the human heart in the diagram below:
A.
B.
C.
D.
7. The 'dup' sound of the heart corresponds to the closing of the mitral and tricuspid valves.
True
False
8. Number the following events of electrical conduction in the heart in the correct order (1-4):
Signal travels to Purkinje fibers
SA node initiates impulse
Impulse reaches AV node
Signal passes through Bundle of His and bundle branches
9. Explain the pressure changes that occur in the left atrium, left ventricle, and aorta during a complete cardiac cycle. How do these pressure changes relate to valve opening and closing?