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

Which of the following statements is correct in reference to heart function?

The sinoatrial node acts as the natural pacemaker of the heart.

The atrioventricular node directly stimulates the ventricles to contract.

The right atrium receives oxygenated blood from the lungs.

The left ventricle pumps blood into the pulmonary circulation.

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Verified step by step guidance

Identify the role of the sinoatrial (SA) node in heart function. The SA node is known as the natural pacemaker of the heart because it initiates the electrical impulses that set the rhythm for the heart to beat.

Understand the function of the atrioventricular (AV) node. The AV node receives impulses from the SA node and relays them to the ventricles, but it does not directly stimulate the ventricles to contract. Instead, it passes the impulse to the bundle of His and Purkinje fibers, which then stimulate ventricular contraction.

Clarify the blood flow into the right atrium. The right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae, not oxygenated blood from the lungs.

Examine the role of the left ventricle. The left ventricle pumps oxygenated blood into the systemic circulation through the aorta, not into the pulmonary circulation.

Conclude by identifying the correct statement: The sinoatrial node acts as the natural pacemaker of the heart, which is the accurate description of its function in heart physiology.