Exchanging Substances Flashcards Preview

B1 > Exchanging Substances > Flashcards

Flashcards in Exchanging Substances Deck (14):
1

Why do cells diffuse

To take in a substance

2

How do you work out the surface area to volume ratio

Work out the surface area then work out the volume put it into a ratio then to get the ratio so that the volume is equal to 1 divide both sides of the ratio by the volume

3

What can a single celled organisms do

Can exchange all substances they need across their surface

4

What can multicellular organisms do

They can’t exchange enough substances across the outside surface alone

5

What do multicellular organisms have which single celled organisms don’t

specialised exchange services

6

What do adapted exchange surfaces have

A thin membrane a large surface area

7

Where does gas exchange happen

In the lungs

8

What is exchanged in the lungs

Corbin dioxide and oxygen

9

What do the lungs contain to help gas exchange

Air sacs called alveoli

10

How are alveoli specialised for the diffusion

They have a large surface area very thin walls and a good blood supply

11

What does the Villi provide

A big surface area

12

Where is the villa located

The small intestines

13

What does the Villi do

Increases surface area so that digested food is absorbed more quickly into the blood

14

How is the Villi adapted

Have a single layer of surface cells and very good blood supply