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Questions and Answers
What is the primary mechanism for gas exchange?
What is the primary mechanism for gas exchange?
- Osmosis through a membrane
- Facilitated diffusion through a membrane
- Passive diffusion across a surface (correct)
- Active transport across a surface
Where is the gas exchange membrane in small unicellular organisms?
Where is the gas exchange membrane in small unicellular organisms?
- Cell membrane (correct)
- Mitochondrial membrane
- Nuclear membrane
- Endoplasmic reticulum membrane
Which organisms typically have a high surface-area to volume ratio for efficient gas exchange?
Which organisms typically have a high surface-area to volume ratio for efficient gas exchange?
- Unicellular organisms (correct)
- Large multicellular organisms
- Vertebrates
- Invertebrates
How do some small multicellular organisms, like flatworms, perform gas exchange?
How do some small multicellular organisms, like flatworms, perform gas exchange?
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Why do larger organisms require a specialized system for gas exchange?
Why do larger organisms require a specialized system for gas exchange?
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Study Notes
Gas Exchange Mechanisms
- Primary mechanism for gas exchange is diffusion across a membrane
- In small unicellular organisms, the gas exchange membrane is the cell membrane itself
Efficient Gas Exchange
- Organisms with a high surface-area to volume ratio, such as protists and some bacteria, can efficiently exchange gases
Multicellular Organisms
- Small multicellular organisms, like flatworms, perform gas exchange through their body surface, which is in direct contact with the environment
Specialized Gas Exchange Systems
- Larger organisms require a specialized system for gas exchange due to their lower surface-area to volume ratio, making it difficult for gases to diffuse across the cell membrane
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