Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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

Simple and Facilitated Diffusion

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Simple and Facilitated Diffusion

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Multiple Choice

Which of these statements describes some aspect of facilitated diffusion?

Facilitated diffusion is another name for osmosis.

Facilitated diffusion of solutes occurs through phospholipid pores in the membrane.

Facilitated diffusion requires energy to drive a concentration gradient.

There is only one kind of protein pore for facilitated diffusion.

Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane.

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Verified step by step guidance

Facilitated diffusion is a type of passive transport, meaning it does not require energy input from the cell. It relies on the concentration gradient to move substances across the cell membrane.

In facilitated diffusion, specific molecules are transported across the cell membrane with the help of transport proteins. These proteins can be either channel proteins or carrier proteins.

Channel proteins form pores in the cell membrane, allowing specific molecules or ions to pass through by diffusion. These channels can be gated, opening or closing in response to certain stimuli.

Carrier proteins bind to the molecules they transport, undergoing a conformational change to move the molecule across the membrane. This process is selective and specific to the molecules being transported.

Facilitated diffusion is distinct from osmosis, which is the diffusion of water across a semipermeable membrane. It also differs from active transport, which requires energy to move substances against their concentration gradient.