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

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0:31 minutes

Problem 1

Textbook Question

Fill in the following concept map to review the processes by which molecules move across membranes.

Verified step by step guidance

Identify the two main types of transport across cell membranes: passive transport and active transport.

Recognize that passive transport includes diffusion and facilitated diffusion, which do not require energy.

Understand that diffusion involves the movement of molecules from an area of higher concentration to an area of lower concentration, typically involving small or nonpolar molecules.

Facilitated diffusion involves the use of transport proteins to move polar molecules and ions across the membrane without energy input.

Active transport requires energy, usually in the form of ATP, to move molecules against their concentration gradient, often using transport proteins like pumps.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Passive Transport

Passive transport is the movement of molecules across a cell membrane without the use of energy. This process occurs along the concentration gradient, meaning substances move from areas of higher concentration to areas of lower concentration. Common examples include diffusion and facilitated diffusion, where specific proteins assist in the transport of molecules.

Active Transport

Active transport is the process by which molecules move across a cell membrane against their concentration gradient, requiring energy input, typically in the form of ATP. This mechanism is crucial for maintaining cellular concentrations of ions and other substances, allowing cells to uptake necessary nutrients and expel waste products efficiently.

Diffusion

Diffusion is a type of passive transport where molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached. This process is essential for the movement of small, nonpolar molecules, such as oxygen and carbon dioxide, across cell membranes, facilitating vital biological functions like respiration.