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

Which of the following is a characteristic of the plasma membrane?

It is rigid and inflexible.

It is composed entirely of carbohydrates.

It allows all substances to pass freely.

It is selectively permeable.

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Verified step by step guidance

Understand the structure of the plasma membrane: The plasma membrane is primarily composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. This structure provides fluidity and flexibility, not rigidity.

Recognize the role of carbohydrates: Carbohydrates are present on the extracellular surface of the plasma membrane, often attached to proteins and lipids, forming glycoproteins and glycolipids. They are not the main component of the membrane.

Identify the concept of selective permeability: The plasma membrane is selectively permeable, meaning it allows certain substances to pass through while restricting others. This is crucial for maintaining homeostasis within the cell.

Differentiate between selective permeability and free passage: Unlike a freely permeable membrane, the plasma membrane uses various mechanisms such as protein channels and transporters to control the movement of substances.

Conclude with the correct characteristic: Based on the understanding of the plasma membrane's structure and function, the correct characteristic is that it is selectively permeable, allowing the cell to regulate its internal environment effectively.