Podcast
Questions and Answers
What is the primary process by which gases move across a surface?
What is the primary process by which gases move across a surface?
- Osmosis
- Facilitated diffusion
- Active transport
- Diffusion (correct)
Which structure provides the large surface area needed for effective gas exchange in most larger organisms?
Which structure provides the large surface area needed for effective gas exchange in most larger organisms?
- Pulmonary alveoli (correct)
- Cell membrane
- Cuticle
- Spongy mesophylls
What is the gas exchange membrane typically for small, particularly unicellular organisms?
What is the gas exchange membrane typically for small, particularly unicellular organisms?
- Mitochondrial membrane
- Nuclear envelope
- Cell membrane (correct)
- Endoplasmic reticulum
Which organisms are able to perform sufficient gas exchange across the skin or cuticle that surrounds their bodies?
Which organisms are able to perform sufficient gas exchange across the skin or cuticle that surrounds their bodies?
Why do larger organisms require specialised structures for gas exchange?
Why do larger organisms require specialised structures for gas exchange?
What is the primary process by which gases move across a surface during gas exchange?
What is the primary process by which gases move across a surface during gas exchange?
Which structure typically serves as the gas exchange membrane for small, particularly unicellular organisms?
Which structure typically serves as the gas exchange membrane for small, particularly unicellular organisms?
In most larger organisms, what provides the large surface area needed for effective gas exchange?
In most larger organisms, what provides the large surface area needed for effective gas exchange?
What is the gas exchange surface for some small multicellular organisms, such as flatworms?
What is the gas exchange surface for some small multicellular organisms, such as flatworms?
Why do small, particularly unicellular organisms have a high surface-area to volume ratio?
Why do small, particularly unicellular organisms have a high surface-area to volume ratio?
