Label your diagram: Discuss: What are the differences between veins, arteries and capillaries? Why do they have these differences?

Label your diagram:

Discuss:

What are the differences between veins, arteries and

capillaries? Why do they have these differences?

Arteries:

Carry blood carrying O2 away from the heart to the cells

Have narrow diameter to create high blood pressure Have thick walls to cope

with the high pressure Veins:

Take blood carrying CO2 back to the heart

Have thin walls and wide diameter because blood pressure is much lower

Capillaries:

Connect arteries and veins – lots of them to create large surface area

They are one cell thick which allows O2 and CO2 to pass through easily to the cells for respiration

Worksheet: Transport for respiration

Do not write on the sheet

Hand it back in at the end of the lesson!

Worksheet: Transport for respiration1) Plasma (not a TV...) carries water around the body, and

glucose is dissolved in this plasma2) Red blood cells carry the oxygen in the blood3) Haemoglobin is the chemical inside the blood which carries

the oxygen4) Arteries carry “oxygenated” blood away from the heart to

our cells. Veins carry “de-oxygenated” blood (containing carbon dioxide) from the cells back to the heart and lungs

5) “Well adapted” means “suited” 6) Capillaries lie in between arteries and veins and they allow

O2 and CO2 to pass in to the cells. They can do this because they are very thin – only one cell thick

7) Red blood cells are well adapted for carrying O2 because they are flexible and their shape can carry a lot of haemoglobin