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

Which of the following descriptions of cardiac pacemaker cells is incorrect?

They have the ability to generate action potentials spontaneously.

They help regulate the heart rate by controlling the timing of contractions.

They require external neural input to initiate each heartbeat.

They are primarily located in the sinoatrial node.

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Verified step by step guidance

Understand the role of cardiac pacemaker cells: These cells are specialized cells in the heart that have the ability to generate action potentials spontaneously, which means they can initiate electrical impulses without external stimuli.

Identify the primary location of pacemaker cells: The sinoatrial (SA) node, located in the right atrium of the heart, is the primary pacemaker of the heart. It sets the pace for the heart rate by generating regular electrical impulses.

Recognize the function of pacemaker cells in heart rate regulation: Pacemaker cells help regulate the heart rate by controlling the timing of heart contractions, ensuring that the heart beats in a coordinated and rhythmic manner.

Evaluate the statement about external neural input: Pacemaker cells do not require external neural input to initiate each heartbeat. They are capable of automaticity, meaning they can generate impulses independently.

Determine the incorrect description: Based on the understanding that pacemaker cells can spontaneously generate action potentials and do not need external neural input, the statement 'They require external neural input to initiate each heartbeat' is incorrect.