B2.2.1 - Exchange and transport Flashcards
Why is surface area to volume ratio important?
So that the larger the surface area to volume ratio is the higher the rate of diffusion, osmosis and active transport in cells
Why do lungs contain many alveoli?
To maximise the rate of diffusion of oxygen into the bloodstream
What is surface area to volume ratio?
It is the surface per unit volume of an object
The larger the organism…
the lower the surface area to volume ratio
Why do the walls of the small intestine contain villi?
In order to increase the surface area of the intestine wall
Why are transport systems needed in our body?
Once a required substance has diffused into our body, it must be transported to where it is needed
What is an example of transport systems in our body?
When urea is produced it is transported to the kidney where it is removed as it it toxic
