1. Starter – What is the difference between the blood in the arteries, veins and capillaries

2. Explain the difference between the terms open and closed circulatory system
Describe the structure and functions of arteries, veins and capillaries

3. Lumen
The gap in the middle of the vessel

4. Remember its all about structure and function
Small lumen – for high pressure
Smooth endothelium – Reduce friction
Elastic fibres – allow for stretch and recoil
Smooth muscle – Allow for constriction of the artery if needed
Collagen fibres – To with stand the high pressure and stop you popping

5. Its still about structure and function
Large lumen – pressure has dropped so lowering resistance
Smooth endothelium – Reduce friction
Collage fibres, smooth muscle and elastic fibres – all relatively few as the pressure has dropped
Valves – This is the key point, prevent back flow

6. One cell think – allows for easy diffusion
Narrow lumen – allows only one blood cell down at a time, this slows the flow rate and allows time for diffusion

8. TRANSVERSE SECTION THROUGH AN ARTERY
Connective
tissue
Smooth muscle
and elastic
tissue
LUMEN
Endothelium