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)

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which wave in an electrocardiogram (ECG) represents ventricular repolarization?

QRS complex

P wave

T wave

U wave

Previous problemNext problem

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 over time, and it consists of several waves: P wave, QRS complex, T wave, and sometimes a U wave.

Identify the function of each wave in the ECG. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. The U wave, when present, is less understood but may represent repolarization of the Purkinje fibers.

Focus on the T wave. Ventricular repolarization is the process by which the ventricles recover from the depolarization phase and prepare for the next cycle of contraction. This is depicted by the T wave in the ECG.

Consider the physiological significance of ventricular repolarization. It is crucial for the heart's function as it ensures that the ventricles are ready for the next heartbeat, maintaining the rhythm and efficiency of the heart's pumping action.

Review the importance of correctly interpreting the T wave in clinical settings. Abnormalities in the T wave can indicate various cardiac conditions, such as ischemia or electrolyte imbalances, making it an essential component of cardiac diagnostics.