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 can cross the plasma membrane due to its selective permeability?

Sodium ions

Oxygen molecules

Glucose molecules

Large proteins

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Verified step by step guidance

Understand the concept of selective permeability: The plasma membrane allows certain substances to pass through while blocking others, based on factors like size, charge, and solubility.

Identify the characteristics of the substances listed: Sodium ions are charged particles, glucose molecules are large polar molecules, and large proteins are even larger and typically polar or charged.

Consider the nature of oxygen molecules: Oxygen is a small, nonpolar molecule, which allows it to easily diffuse across the lipid bilayer of the plasma membrane.

Recall the mechanism of diffusion: Nonpolar molecules like oxygen can passively diffuse through the lipid bilayer without the need for transport proteins or energy.

Conclude why oxygen molecules can cross the plasma membrane: Due to their small size and nonpolar nature, oxygen molecules can move freely across the membrane, unlike charged ions or large polar molecules.