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

In the electrical conduction system of the heart, which part of the ECG waveform represents ventricular depolarization?

T wave

QRS complex

P wave

PR interval

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Verified step by step guidance

Understand the components of the ECG waveform: The ECG (Electrocardiogram) is a graphical representation of the electrical activity of the heart. It consists of several key components: P wave, QRS complex, T wave, and PR interval.

Identify the function of each component: The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, the T wave represents ventricular repolarization, and the PR interval represents the time between the onset of atrial depolarization and the onset of ventricular depolarization.

Focus on ventricular depolarization: Ventricular depolarization is the process by which the ventricles of the heart contract, pumping blood to the lungs and the rest of the body. This is a crucial part of the cardiac cycle.

Recognize the QRS complex: The QRS complex is characterized by a rapid sequence of deflections in the ECG waveform. It is typically larger than the P wave and occurs after the PR interval.

Conclude that the QRS complex represents ventricular depolarization: Based on the understanding of the ECG components, the QRS complex is the part of the waveform that corresponds to the electrical activity associated with the contraction of the ventricles.