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

Biological Membranes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Biological Membranes

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Multiple Choice

Why are cell membranes composed primarily of hydrophobic molecules?

Cell membranes must be composed of polar molecules in order to interact with the aqueous solutions inside cells.

In order to maintain a proper pH, cell membranes must be hydrophobic.

Cell membranes must be hydrophobic in order to allow polar and charged molecules to enter and leave the cell.

In order to perform their function of separating the aqueous solutions outside cells from the aqueous solutions inside cells, cell membranes cannot be soluble in water.

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Verified step by step guidance

Understand the structure of cell membranes: Cell membranes are primarily composed of a phospholipid bilayer, which includes hydrophobic (water-repelling) tails and hydrophilic (water-attracting) heads.

Recognize the role of hydrophobic molecules: The hydrophobic tails of phospholipids face inward, away from water, creating a barrier that separates the internal environment of the cell from the external environment.

Consider the function of cell membranes: Cell membranes must be selectively permeable, allowing certain substances to pass while blocking others. The hydrophobic nature helps prevent the free passage of water-soluble substances.

Evaluate the importance of separation: The hydrophobic properties of the cell membrane are crucial for maintaining distinct internal and external environments, which is essential for cellular function and homeostasis.

Connect to the problem statement: The correct answer highlights that cell membranes must be hydrophobic to effectively separate aqueous solutions inside and outside the cell, preventing solubility in water.