Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

18. The Heart

Cardiac Cycle

Anatomy & Physiology

18. The Heart

Cardiac Cycle

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Multiple Choice

Which of the following does not occur during ventricular systole?

Opening of the semilunar valves

Closure of the atrioventricular valves

Filling of the ventricles with blood

Ejection of blood into the aorta and pulmonary artery

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Verified step by step guidance

Understand the phases of the cardiac cycle: The cardiac cycle consists of two main phases, systole and diastole. Systole is the phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.

Identify what happens during ventricular systole: During ventricular systole, the ventricles contract, leading to the closure of the atrioventricular (AV) valves (tricuspid and mitral valves) to prevent backflow into the atria.

Recognize the role of semilunar valves: As the ventricles contract, the pressure inside them rises, causing the semilunar valves (aortic and pulmonary valves) to open, allowing blood to be ejected into the aorta and pulmonary artery.

Determine what does not occur during ventricular systole: Filling of the ventricles with blood does not occur during ventricular systole. Instead, this occurs during diastole when the heart muscle relaxes, and the ventricles fill with blood from the atria.

Conclude the analysis: Based on the understanding of the cardiac cycle, the event that does not occur during ventricular systole is the filling of the ventricles with blood, as this is a characteristic of diastole.