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

Introduction to Membrane Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Membrane Transport

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which molecule most easily diffuses across a biological membrane's lipid bilayer, without help of a protein?

H₂O

O₂

H₂PO₄^-

Glucose

Na⁺

Previous problemNext problem

Verified step by step guidance

Understand the structure of a biological membrane: Biological membranes are primarily composed of a lipid bilayer, which consists of phospholipids with hydrophobic tails and hydrophilic heads.

Identify the properties of molecules that can easily diffuse across the lipid bilayer: Small, nonpolar molecules can pass through the hydrophobic core of the lipid bilayer without assistance.

Analyze the given molecules: Consider the size, polarity, and charge of each molecule. Nonpolar molecules like O2 can diffuse easily, while polar or charged molecules like H2O, H2PO4-, glucose, and Na+ require assistance.

Consider the role of membrane proteins: Charged or large polar molecules typically require transport proteins to cross the membrane, as they cannot pass through the hydrophobic core easily.

Conclude which molecule can diffuse most easily: Based on the properties discussed, O2, being small and nonpolar, can diffuse across the lipid bilayer without the need for a protein.