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

Nervous Tissue: The Neuron

Anatomy & Physiology

4. Tissues & Histology

Nervous Tissue: The Neuron

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Multiple Choice

Which of the following describes what happens when a neuron sends a signal?

The neuron becomes hyperpolarized, preventing any ion movement.

The neuron undergoes depolarization, allowing sodium ions to enter the cell.

The neuron closes all ion channels to maintain resting potential.

The neuron releases potassium ions into the synaptic cleft.

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Verified step by step guidance

Understand the basic structure of a neuron, which includes the cell body, dendrites, and axon. The axon is responsible for transmitting signals.

Learn about the resting membrane potential of a neuron, which is typically around -70 mV. This is maintained by the sodium-potassium pump and selective permeability to ions.

Recognize that when a neuron sends a signal, it undergoes depolarization. This process involves the opening of voltage-gated sodium channels, allowing Na⁺ ions to flow into the cell, making the inside more positive.

Identify that depolarization is a key part of the action potential, which is the electrical signal that travels along the axon to communicate with other neurons or muscles.

Understand that after depolarization, the neuron will repolarize and return to its resting potential, often involving the outflow of K⁺ ions and the closing of sodium channels.