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

Electrical Conduction System of the Heart

Anatomy & Physiology

18. The Heart

Electrical Conduction System of the Heart

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Multiple Choice

The pacemaker potential is also called which of the following?

Resting potential

Action potential

Threshold potential

Prepotential

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Verified step by step guidance

Understand that the pacemaker potential is a unique feature of certain cardiac cells, particularly in the sinoatrial (SA) node, which is responsible for initiating the heartbeat.

Recognize that the pacemaker potential is not a resting potential, as it is not stable and continuously drifts towards the threshold, unlike the resting potential which is stable in non-pacemaker cells.

Differentiate between action potential and pacemaker potential. The action potential is a rapid depolarization and repolarization event, whereas the pacemaker potential is a gradual depolarization that leads to the threshold and triggers the action potential.

Identify that the threshold potential is the membrane potential at which an action potential is triggered, but it is not the same as the pacemaker potential, which is the gradual depolarization leading up to this point.

Conclude that the pacemaker potential is also known as the prepotential, as it precedes the action potential and is responsible for setting the pace of the heartbeat by reaching the threshold potential.