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

Electrical Conduction System of the Heart

Anatomy & Physiology

18. The Heart

Electrical Conduction System of the Heart

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Multiple Choice

How is backflow of blood from the right ventricle into the right atrium prevented?

By the aortic valve closing during ventricular contraction

By the pulmonary valve closing during ventricular contraction

By the mitral valve closing during ventricular contraction

By the tricuspid valve closing during ventricular contraction

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Verified step by step guidance

Understand the anatomy of the heart: The heart has four chambers - two atria and two ventricles. The right atrium receives deoxygenated blood from the body and pumps it into the right ventricle, which then sends it to the lungs.

Identify the valves involved: The heart contains four main valves - the tricuspid valve, pulmonary valve, mitral valve, and aortic valve. Each valve has a specific role in directing blood flow and preventing backflow.

Focus on the right side of the heart: The tricuspid valve is located between the right atrium and the right ventricle. Its primary function is to prevent the backflow of blood from the right ventricle into the right atrium during ventricular contraction.

Understand the mechanism of valve function: During ventricular contraction (systole), the pressure in the right ventricle increases, causing the tricuspid valve to close. This closure prevents blood from flowing backward into the right atrium.

Differentiate from other valves: The pulmonary valve prevents backflow from the pulmonary artery into the right ventricle, the mitral valve prevents backflow from the left ventricle into the left atrium, and the aortic valve prevents backflow from the aorta into the left ventricle. These valves are not involved in preventing backflow from the right ventricle to the right atrium.