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

2. Cell Chemistry & Cell Components

Passive vs. Active Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Passive vs. Active Transport

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Multiple Choice

What allows sodium and potassium ions to flow down their electrochemical gradient across the cell membrane?

Ion channels

Enzymes

Carrier proteins

Receptor proteins

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Verified step by step guidance

Understand the concept of an electrochemical gradient: It is the combination of the concentration gradient and the electrical gradient across a membrane, which influences the movement of ions.

Identify the role of ion channels: Ion channels are proteins that create specific pathways for charged ions to pass through the cell membrane.

Differentiate between ion channels and other proteins: Ion channels allow ions to flow down their electrochemical gradient without the need for energy, unlike carrier proteins which may require energy to transport substances.

Consider the specificity of ion channels: These channels are selective, meaning they allow only specific ions, such as sodium (Na⁺) and potassium (K⁺), to pass through based on size and charge.

Recognize the importance of ion channels in maintaining cellular function: The flow of sodium and potassium ions through these channels is crucial for processes such as nerve impulse transmission and muscle contraction.