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

Atrial depolarization is represented by which of the following waves on an electrocardiogram (ECG)?

T wave

QRS complex

U wave

P wave

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Verified step by step guidance

Step 1: Understand the concept of an electrocardiogram (ECG). An ECG is a graphical representation of the electrical activity of the heart, which includes depolarization and repolarization of the atria and ventricles.

Step 2: Learn the significance of each wave on the ECG. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. The U wave is less commonly seen and may represent delayed repolarization of the Purkinje fibers.

Step 3: Focus on the term 'atrial depolarization' in the question. Depolarization refers to the electrical activation of the heart muscle, and in this case, it specifically refers to the atria.

Step 4: Match the term 'atrial depolarization' with the corresponding wave on the ECG. Based on the definitions, the P wave is the correct representation of atrial depolarization.

Step 5: Confirm your understanding by reviewing the sequence of events in the cardiac cycle as shown on the ECG: P wave (atrial depolarization), QRS complex (ventricular depolarization), and T wave (ventricular repolarization).