Thursday 10 May 2012

Blood vessels

(Key words are highlighted)

Types of blood vessels


Blood vessels are very important as they transport nutrients and oxygen around the body, without them you wouldn't be able to get energy to your muscles or heart. They are practically everywhere inside you, when you cut yourself and you bleed that means you cut open a blood vessel!

A diagram show the positions and comparing the 3 different types
of blood vessel note the arterioles and venules, these are effectively
very small veins and artery's.
http://losrios-training.org/phlebotomy/08_circulatory_system/notes_and_exercises/page9.html
 There are three types of blood vessels, these are the artery(ies), vein(s) and capillary(ies):

Arteries: These are the blood vessels that carry blood away from the heart. They are characterised by their thick muscular walls and narrow lumen. Also they don't contain valves. They require thick muscular walls to cope with the high pressures produced by the heart
Veins: These are the blood vessels that carry blood to the heart. They are characterised by their thinner walls and large lumen. They contain valves to stop the back-flow of blood. Veins require the movement of the body to squeeze the veins to push the blood back up.
Capillaries: These are the blood vessels that come off the arteries to supply the cells with nutrients and oxygen. They are characterised by their....well they are very small basically. They are so small in fact that they are only visible under a microscope! When you cut yourself and bleed that is because you tore some capillaries (if you cut your arteries then your...pretty much dead).

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