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

Change in Membrane Potential

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Change in Membrane Potential

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Multiple Choice

During which phase of an action potential are voltage-gated K⁺ channels open, while voltage-gated Na⁺ channels are closed?

repolarization

depolarization

threshold

resting state

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Verified step by step guidance

Understand the phases of an action potential: An action potential consists of several phases, including depolarization, repolarization, and the resting state.

Identify the role of voltage-gated channels: Voltage-gated Na+ channels open during depolarization, allowing Na+ ions to enter the cell, while voltage-gated K+ channels open during repolarization, allowing K+ ions to exit the cell.

Analyze the depolarization phase: During depolarization, voltage-gated Na+ channels are open, and Na+ ions flow into the neuron, making the inside more positive.

Examine the repolarization phase: In this phase, voltage-gated Na+ channels close, and voltage-gated K+ channels open, allowing K+ ions to leave the cell, which helps return the membrane potential to a negative value.

Conclude with the resting state: At the resting state, both voltage-gated Na+ and K+ channels are closed, and the neuron is ready to respond to a new stimulus.