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 in the neuron are always open?

voltage-gated channels

mechanically gated channels

leakage channels

ligand-gated channels

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Verified step by step guidance

Understand the function of different types of ion channels in neurons. Ion channels are proteins that allow ions to pass through the membrane in response to various stimuli.

Voltage-gated channels open or close in response to changes in membrane potential. They are not always open, as they respond to specific voltage changes.

Mechanically gated channels open in response to physical deformation of the receptor, such as stretching or pressure. These are also not always open, as they require a mechanical stimulus.

Ligand-gated channels open in response to the binding of a chemical messenger (ligand), such as a neurotransmitter. These channels are not always open, as they depend on the presence of a specific ligand.

Leakage channels, also known as passive channels, are always open. They allow ions to move across the membrane according to their concentration gradient, contributing to the resting membrane potential of the neuron.