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

What does the QRS wave of the electrocardiogram (ECG) represent?

Ventricular depolarization

Ventricular repolarization

Atrial repolarization

Atrial depolarization

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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, each representing different phases of the cardiac cycle.

Identify the QRS complex: The QRS complex is one of the most prominent features on an ECG. It typically follows the P wave and precedes the T wave.

Recognize the physiological process: The QRS complex represents the depolarization of the ventricles. This is the process where the ventricles prepare to contract and pump blood out of the heart.

Differentiate between depolarization and repolarization: Depolarization is the electrical activation of the heart muscle, leading to contraction, while repolarization is the process of the heart muscle returning to its resting state.

Relate the QRS complex to the options given: Among the options provided, the QRS wave corresponds to ventricular depolarization, as it signifies the electrical activity that leads to the contraction of the ventricles.