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 is not true for ventricular systole?

The pressure in the ventricles rises sharply.

The ventricles contract and pump blood into the arteries.

The atrioventricular valves are open.

The semilunar valves are open.

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Verified step by step guidance

Understand the concept of ventricular systole: Ventricular systole is the phase of the cardiac cycle during which the ventricles contract, leading to the ejection of blood into the arteries.

Identify the role of valves during ventricular systole: During this phase, the semilunar valves (aortic and pulmonary valves) open to allow blood to flow into the arteries, while the atrioventricular valves (tricuspid and mitral valves) close to prevent backflow into the atria.

Analyze the statement about pressure: During ventricular systole, the pressure in the ventricles rises sharply as the ventricles contract to pump blood.

Evaluate the statement about the semilunar valves: The semilunar valves are indeed open during ventricular systole to facilitate the ejection of blood into the arteries.

Assess the statement about the atrioventricular valves: The atrioventricular valves are closed during ventricular systole to prevent the backflow of blood into the atria, making the statement 'The atrioventricular valves are open' incorrect.