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 Heart2h 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 of the following membrane ion channels open and close in response to changes in the membrane potential?

voltage-gated channels

chemically gated channels

mechanically gated channels

nongated channels

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Verified step by step guidance

Understand the types of ion channels: Ion channels are proteins that allow ions to pass through the membrane in response to various stimuli. The main types include voltage-gated, chemically gated, mechanically gated, and nongated channels.

Define voltage-gated channels: These channels open and close in response to changes in the membrane potential. They are crucial for the initiation and propagation of action potentials in neurons and muscle cells.

Differentiate from other channels: Chemically gated channels open in response to binding of a chemical messenger (ligand), mechanically gated channels respond to physical deformation, and nongated channels (leak channels) are always open and allow ions to move along their gradient.

Identify the correct answer: Since the question asks for channels that respond to changes in membrane potential, voltage-gated channels are the correct answer.

Review the role of voltage-gated channels: These channels are essential in the function of excitable cells, such as neurons and muscle cells, where they help propagate electrical signals by opening in response to changes in voltage across the cell membrane.