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

During which phase of the cardiac cycle is ventricular pressure greater than aortic pressure?

Ventricular ejection

Isovolumetric contraction

Isovolumetric relaxation

Atrial systole

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Verified step by step guidance

Understand the phases of the cardiac cycle: The cardiac cycle consists of several phases, including atrial systole, isovolumetric contraction, ventricular ejection, and isovolumetric relaxation.

Identify the phase where ventricular pressure exceeds aortic pressure: During the cardiac cycle, ventricular pressure must exceed aortic pressure for blood to be ejected from the ventricles into the aorta.

Focus on the ventricular ejection phase: In this phase, the ventricles contract, increasing the pressure within them. Once the ventricular pressure surpasses the aortic pressure, the aortic valve opens, allowing blood to flow into the aorta.

Differentiate from other phases: In isovolumetric contraction, the ventricles contract but the aortic valve remains closed, so ventricular pressure is not yet greater than aortic pressure. In isovolumetric relaxation, the ventricles relax and pressure decreases. During atrial systole, the atria contract, not the ventricles.

Conclude that the ventricular ejection phase is when ventricular pressure is greater than aortic pressure, allowing blood to be ejected into the aorta.