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

Change in Membrane Potential

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Change in Membrane Potential

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Multiple Choice

How does a neuron cell membrane become depolarized?

By the influx of calcium ions into the cell

By the efflux of potassium ions out of the cell

By the efflux of chloride ions out of the cell

By the influx of sodium ions into the cell

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Verified step by step guidance

Understand the concept of depolarization: Depolarization is a change in a cell's membrane potential, making it more positive. In neurons, this is a crucial step in the transmission of electrical signals.

Identify the role of ions in membrane potential: Neurons maintain a resting membrane potential through the distribution of ions, primarily sodium (Na+), potassium (K+), and chloride (Cl-).

Recognize the movement of sodium ions: During depolarization, sodium channels open, allowing Na+ ions to flow into the neuron, making the inside of the cell more positive.

Differentiate from other ion movements: While potassium ions (K+) moving out of the cell and chloride ions (Cl-) moving in can affect membrane potential, depolarization specifically involves the influx of Na+.

Conclude the process: The influx of sodium ions into the neuron is the primary mechanism that causes depolarization, leading to the propagation of an action potential along the neuron.