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

Introduction to Membrane Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Membrane Transport

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Multiple Choice

Why are ion channels necessary for the transport of ions into or out of a cell?

Ion channels are responsible for the synthesis of ions within the cell.

Ion channels allow ions to move across the cell membrane down their concentration gradient.

Ion channels actively transport ions against their concentration gradient using ATP.

Ion channels provide a hydrophobic pathway for ions to pass through the lipid bilayer.

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Verified step by step guidance

Understand the structure of the cell membrane: The cell membrane is primarily composed of a lipid bilayer, which is hydrophobic and acts as a barrier to most ions, preventing them from freely passing through.

Recognize the role of ion channels: Ion channels are specialized proteins embedded in the cell membrane that provide a hydrophilic pathway for ions to pass through, allowing them to move across the membrane.

Identify the mechanism of ion movement: Ion channels facilitate the passive transport of ions, meaning ions move down their concentration gradient without the use of energy (ATP). This is crucial for maintaining cellular homeostasis.

Distinguish between passive and active transport: Unlike ion pumps, which actively transport ions against their concentration gradient using ATP, ion channels do not require energy and rely on the natural movement of ions from areas of high concentration to low concentration.

Clarify the misconception: Ion channels do not synthesize ions nor provide a hydrophobic pathway; instead, they allow ions to move across the cell membrane by providing a hydrophilic route, essential for various physiological processes.