B2.2.1 Exchange And Transport Flashcards
1
Q
Surface area to volume ratio
A
Surface area per unit volume of an object
2
Q
The larger the organism
A
The lower the surface area to volume ratio
3
Q
How is alveoli adapted
A
Thin walls for shorter diffusion distance
Spherical shape for larger surface area for diffusion
Surrounded by blood capillaries so maintains concentration gradient by allowing easy diffusion
4
Q
How do villi maximise diffusion rate
A
Increase surface area of intestine wall
5
Q
Why are transport systems needed
A
To transport all substances to where they are needed
