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

Electrocardiogram (ECG)

Anatomy & Physiology

18. The Heart

Electrocardiogram (ECG)

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Multiple Choice

Ventricular depolarization and repolarization are represented by which measure on an electrocardiogram (ECG)?

T wave

QRS complex

P wave

PR interval

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Verified step by step guidance

Understand the components of an electrocardiogram (ECG): An ECG is a graphical representation of the electrical activity of the heart. It consists of several waves and intervals that correspond to different phases of the cardiac cycle.

Identify the phases of the cardiac cycle: The cardiac cycle includes depolarization and repolarization of the heart chambers. Depolarization is the process by which the heart muscle cells become electrically activated, leading to contraction, while repolarization is the process of returning to the resting state.

Recognize the ECG components: The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. The PR interval is the time between the onset of the P wave and the start of the QRS complex, indicating the conduction time from the atria to the ventricles.

Focus on ventricular activity: Ventricular depolarization is represented by the QRS complex, which is typically the largest wave on the ECG due to the significant electrical activity involved in ventricular contraction.

Understand the role of the T wave: The T wave follows the QRS complex and represents ventricular repolarization, which is the recovery phase after the ventricles have contracted.