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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

Biological Membranes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Biological Membranes

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Multiple Choice

What is the primary function of cholesterol in the plasma membrane?

To act as a receptor for signaling molecules

To increase membrane fluidity at low temperatures

To transport ions across the membrane

To provide energy for cellular processes

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Verified step by step guidance

Understand the structure of the plasma membrane: The plasma membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.

Identify the role of cholesterol in the membrane: Cholesterol is interspersed within the phospholipid bilayer of the plasma membrane.

Analyze how cholesterol affects membrane fluidity: Cholesterol modulates the fluidity of the membrane by preventing the fatty acid chains of the phospholipids from packing too closely together.

Consider the temperature-dependent effects: At low temperatures, cholesterol increases membrane fluidity by preventing the phospholipids from becoming too rigid.

Conclude the primary function: The primary function of cholesterol in the plasma membrane is to increase membrane fluidity at low temperatures, ensuring proper membrane function and flexibility.