Arteries Veins and Capillaries

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Artery

(http://www.passmyexams.co.uk/GCSE/biology/images/artery_new.jpg)

  • Artery has a thick wall

 

  • Thin smooth inner endothelial wall - prevents blood from clotting inside vessels

 

  • Thick muscle/elastic fibre layer - to stretch to accomodate pressure changes

 

  • Tough outer layer of collagen fibres - prevents rupturing

 

  • Lumen size is small in comparison to it's thick wall - this to maintain high blood pressure

 

  • It's function is to carry oxygenated blood to all major organs in the body.

 

  • They subdivide and branch out into arterioles - become finer and smaller

 

  • Have no valves, except in the aorta and pulmonary artery - prevents blood flowing back to the heart.

Vein

(http://www.passmyexams.co.uk/GCSE/biology/images/veins_new.jpg)

Comments

Sam Morran

This is a good, clear resource that summarises the differences between the three vessels.  I like the fact that it is short and concise and has clear pictures with it.

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