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 of the following is the second wave on an electrocardiogram (ECG)?

P wave

T wave

Q wave

R wave

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Verified step by step guidance

Understand the basic components of an electrocardiogram (ECG). An ECG records the electrical activity of the heart and is represented by different waves: P wave, QRS complex, and T wave.

Identify the sequence of waves in a typical ECG. The P wave represents atrial depolarization, followed by the QRS complex which represents ventricular depolarization, and finally the T wave which represents ventricular repolarization.

Recognize that the QRS complex is composed of three waves: Q wave, R wave, and S wave. These waves occur in rapid succession and are collectively responsible for the ventricular depolarization.

Determine the order of the waves within the QRS complex. The Q wave is the first negative deflection after the P wave, followed by the R wave which is a positive deflection, and then the S wave which is a negative deflection.

Conclude that the second wave on an ECG, considering the sequence of waves, is the R wave, as it follows the Q wave within the QRS complex.