Exchanging Materials Flashcards
1
Q
What ways do organisms exchange substances
A
Osmosis , Diffusion and Active Transport
2
Q
What does SA : V stand for
A
Surface area to volume ratio
3
Q
In a small object the SA : V ratio is ………
A
High
4
Q
Why can’t bigger object use just diffusion
A
Gases and food can’t reach every cell
5
Q
What Adaptations do cells have to exchange substances
A
- A large surface area
- Thin membrane
- Sufficient blood supply
- Ventilation
6
Q
How does the Fitzroy river turtle breath underwater?
A
- Has two large sacs in rear opening lined with finger folds for a large surface area
- Has a rich blood supply
- Rear opening pumps water in and out
7
Q
What adaptations do humans have
A
- Air moved in and out of long by breathing
- Alveoli have a large surface area and blood supply
- Villi of the small intestine provide a large surface area
8
Q
What adaptations do fish have
A
- Exchange oxygen and carbon dioxide between the water and blood across the gills
- Gills made of stacks of thin filaments
- Have a constant flow of water over gills
- They pump water over gills over a flap that covers the gills
9
Q
What adaptations do plant roots have
A
- Have a large surface area (due to root hair cells)
- Water moves away from the roots in transpiration stream
- Has a steep concentration gradient
10
Q
What adaptations do leaves have
A
- Have flat thin leaves which provide a large surface area (Also air sacs and stomata)
- Have a steep concentration gradient