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

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 statements about sodium and potassium ion channels is true?

Potassium ion channels open during depolarization to allow potassium ions to enter the cell.

Sodium ion channels open rapidly during depolarization, allowing sodium ions to enter the cell.

Potassium ion channels close immediately after depolarization begins.

Sodium ion channels are primarily responsible for repolarization of the neuron.

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Verified step by step guidance

Understand the role of ion channels in neuron function: Ion channels are crucial for the generation and propagation of action potentials in neurons. They regulate the flow of ions across the cell membrane, which is essential for electrical signaling.

Identify the phases of an action potential: An action potential consists of depolarization, repolarization, and hyperpolarization phases. During depolarization, the neuron's membrane potential becomes less negative, while repolarization restores the resting potential.

Examine the function of sodium ion channels: During depolarization, sodium ion channels open rapidly, allowing Na⁺ ions to enter the cell. This influx of sodium ions causes the membrane potential to become more positive.

Analyze the role of potassium ion channels: Potassium ion channels open later in the action potential, typically during repolarization. They allow K⁺ ions to exit the cell, helping to restore the negative membrane potential.

Evaluate the statements: The correct statement is that sodium ion channels open rapidly during depolarization, allowing sodium ions to enter the cell. This is a key step in the initiation of an action potential.