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 would not move freely across the cytoplasmic membrane?

Carbon dioxide

Water molecules

Glucose

Oxygen molecules

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Verified step by step guidance

Understand the structure of the cytoplasmic membrane: The cytoplasmic membrane, also known as the plasma membrane, is primarily composed of a phospholipid bilayer with embedded proteins. This structure is selectively permeable, allowing certain molecules to pass through while restricting others.

Identify the types of molecules: The molecules mentioned are carbon dioxide, water, glucose, and oxygen. These can be categorized based on their size, polarity, and whether they are charged or uncharged.

Consider the permeability of small nonpolar molecules: Small nonpolar molecules like carbon dioxide and oxygen can diffuse freely across the lipid bilayer due to their nonpolar nature and small size.

Evaluate the permeability of small polar molecules: Water molecules, although polar, can move across the membrane through specialized channels called aquaporins, allowing them to pass relatively freely.

Analyze the permeability of larger polar molecules: Glucose is a larger polar molecule and cannot move freely across the lipid bilayer. It requires specific transport proteins, such as glucose transporters, to facilitate its movement across the membrane.