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

Active Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Active Transport

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Problem 9

Textbook Question

Which of the following forms of membrane transport require specific membrane proteins?a. diffusion;b. exocytosis;c. facilitated diffusion;d. active transport;e. facilitated diffusion and active transport

Verified step by step guidance

Identify the types of membrane transport listed in the options: diffusion, exocytosis, facilitated diffusion, and active transport.

Understand that diffusion is a passive process where molecules move from an area of higher concentration to an area of lower concentration without the need for membrane proteins.

Recognize that exocytosis is a form of bulk transport where materials are expelled from the cell, involving vesicles rather than specific membrane proteins.

Facilitated diffusion is a passive transport process that requires specific membrane proteins, such as channels or carriers, to help move substances across the cell membrane.

Active transport is an energy-dependent process that also requires specific membrane proteins, such as pumps, to move substances against their concentration gradient.

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Key Concepts

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

Membrane Transport

Membrane transport refers to the mechanisms by which substances move across the cell membrane. This process is crucial for maintaining cellular homeostasis and involves various methods, including passive and active transport. Understanding these mechanisms helps in grasping how cells interact with their environment and regulate internal conditions.

Facilitated Diffusion

Facilitated diffusion is a type of passive transport that requires specific membrane proteins to help move molecules across the cell membrane. Unlike simple diffusion, which occurs directly through the lipid bilayer, facilitated diffusion utilizes carrier or channel proteins to assist in the transport of larger or polar molecules, ensuring they can enter or exit the cell efficiently.

Active Transport

Active transport is a process that moves substances against their concentration gradient, requiring energy, usually in the form of ATP. This transport is mediated by specific membrane proteins known as pumps. Active transport is essential for maintaining concentration differences of ions and molecules across the membrane, which is vital for various cellular functions.