Arteries:

Carry blood carrying O2 away from the heart to the cells

Veins:

Take blood carrying CO2 back to the heart and lungs

Capillaries:

Allow the O2 and CO2 to pass through to the cells for respiration

What does each blood vessel do?

Label your diagram:

Discuss:

What are the differences between veins, arteries and

capillaries? Why do they have these differences?

Arteries:

Have narrow diameter to create high blood pressure to ensure the blood pumps all around the body

Have thick walls to cope with the high pressure

Veins:

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

Capillaries:

They are one cell thick so O2 and CO2 can pass through to the cells easily

Lots of them to create large surface area

“YMCA” Quiz

• For each of the following questions,use your arms to sign:

A = ArteryV = VeinC = Capillary

I have thick walls

A

I carry de-oxygenated blood

V

I am just 1 cell thick

C

I carry blood to the heart

V

I have high pressure

A

I carry CO2

V

I carry blood to the heart

V

I am between the veins and the arteries

C

I carry O2, glucose and amino acids to the cells

A

I am responsible for absorption to and from

cells

C

I carry blood from the heart

A

I have thin walls and low pressure

V

On the count of 3, put “the pipes” in order of increasing

thickness

C – V – A

1) Clip: how to fix a hole in the heart (2min)

2) Then: what causes a heart attack?

3) Clip: heart attack in 3D (1min)

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