1. Growth and Development of different organisms
National 5 Biology
Key Area 6:
The Need for Transport
(b) Animal Transport Systems
National 4 Biology
Key Area 4
Growth and Development of different organisms

2. By the end of this lesson you will be able to ....
Give examples of substances transported in the blood
Explain how a red blood cell is specialised for it’s function.

3. The Blood
Nutrients, oxygen, carbon dioxide and hormones are transported in the blood.

4. Function
To transport oxygen around the body
Specialisation
Large surface area for oxygen transport
Biconcave shape
Contains a haemoglobin which binds with oxygen

5. Red Blood Cell Function: To transport oxygen around the body.
Biconcave in shape (large surface area)
No nucleus (more space for haemoglobin)
Contains haemoglobin which binds to oxygen to form oxyhaemoglobin.
Oxyhaemoglobin then loses it’s oxygen to body cells.
Haemoglobin
+ oxygen
oxyhaemoglobin