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

2. Cell Chemistry & Cell Components

Biological Membranes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Biological Membranes

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Multiple Choice

Consider the currently accepted fluid mosaic model of the plasma membrane. Where in the plasma membrane would cholesterol most likely be found?

On the outside (external) surface of the membrane

On the inside (cytoplasmic) surface

In the interior and on the inside surface but not on the outside surface

On either surface of the membrane but not in the interior of the membrane

In the interior of the membrane

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Verified step by step guidance

Understand the fluid mosaic model: The plasma membrane is composed of a phospholipid bilayer with embedded proteins, carbohydrates, and cholesterol. This model describes the membrane as a dynamic and flexible structure.

Identify the role of cholesterol: Cholesterol is a lipid molecule that plays a crucial role in maintaining membrane fluidity and stability. It is interspersed within the phospholipid bilayer.

Locate cholesterol within the membrane: Cholesterol is found within the interior of the membrane, nestled between the phospholipid tails. This positioning helps modulate the fluidity of the membrane by preventing the fatty acid chains of the phospholipids from packing too closely together.

Differentiate between membrane surfaces: The plasma membrane has an external surface facing the extracellular environment and an internal surface facing the cytoplasm. Cholesterol is not limited to either surface but is embedded within the hydrophobic core of the bilayer.

Conclude the location of cholesterol: Based on the fluid mosaic model, cholesterol is most likely found in the interior of the membrane, contributing to its structural integrity and fluidity.