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

4. Tissues & Histology

Introduction to Nervous Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Nervous Tissue

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Multiple Choice

Which of the following is a feature of a myelinated axon?

Dendritic spines

Sarcomeres

Nodes of Ranvier

Intercalated discs

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Understand the structure and function of a myelinated axon: Myelinated axons are covered by a fatty substance called myelin, which insulates the axon and increases the speed of electrical signal transmission.

Learn about the Nodes of Ranvier: These are small gaps in the myelin sheath along the axon where the axon membrane is exposed. They play a critical role in saltatory conduction, allowing the electrical signal to 'jump' from node to node, speeding up transmission.

Clarify why dendritic spines, sarcomeres, and intercalated discs are not features of myelinated axons: Dendritic spines are structures found on dendrites of neurons, sarcomeres are the functional units of muscle fibers, and intercalated discs are specialized connections between cardiac muscle cells. None of these are related to the structure of myelinated axons.

Relate the Nodes of Ranvier to their physiological importance: These nodes contain a high density of voltage-gated ion channels, which are essential for the generation and propagation of action potentials along the axon.

Conclude that the correct feature of a myelinated axon is the Nodes of Ranvier, as they are integral to its function and structure.