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

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

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Multiple Choice

Which type of ion channels are highly concentrated in the nodes of Ranvier?

Calcium channels

Ligand-gated potassium channels

Chloride channels

Voltage-gated sodium channels

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Verified step by step guidance

Understand the function of the nodes of Ranvier: These are gaps in the myelin sheath of axons that facilitate rapid conduction of nerve impulses.

Recognize the role of ion channels in nerve impulse transmission: Ion channels allow ions to move across the neuronal membrane, which is crucial for generating action potentials.

Identify the specific ion channels involved in action potential propagation: Voltage-gated sodium channels are essential for the depolarization phase of the action potential.

Consider the location of these channels: Voltage-gated sodium channels are highly concentrated at the nodes of Ranvier to enable the rapid influx of sodium ions, which is necessary for the propagation of action potentials along myelinated axons.

Conclude that the high concentration of voltage-gated sodium channels at the nodes of Ranvier is critical for the saltatory conduction of nerve impulses, allowing for efficient and rapid signal transmission along the axon.