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

Which ECG wave represents atrial contraction?

Q wave

P wave

R wave

T wave

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Verified step by step guidance

Understand that an ECG (electrocardiogram) is a test that measures the electrical activity of the heart and is used to identify different phases of the cardiac cycle.

Recognize that the ECG waveform consists of several distinct waves: P wave, QRS complex (which includes Q, R, and S waves), and T wave.

Identify that the P wave represents the electrical activity associated with the contraction of the atria, also known as atrial depolarization.

Note that the QRS complex represents ventricular depolarization, which is the contraction of the ventricles, and the T wave represents ventricular repolarization, which is the recovery phase of the ventricles.

Conclude that the P wave is the correct answer as it specifically corresponds to atrial contraction, distinguishing it from the other waves in the ECG.