Veins carry blood towards the heart
The walls of the vein are thin/flexible
Under low pressure they carry deoxygenated
blood.
One exception to this is the pulmonary vein.
Veins rely on the Veins rely on the skeletal muscle to squeeze
blood along.
Some veins also have valves, for example in
the leg where blood goes against the flow of
gravity
Veins are made up of endothelial lining,
smooth muscle and also elastic tissue.
The most common vein we use to place an The most common vein we use to place an
IVC is the cephalic vein
Others, such as saphenous could also be
used. As well as the marginal ear veins.
Capillaries, arteries and veinsfill in the gaps
Made up a single layer of endothelial cells capillaries are small and
permeable. As well as the uptake of nutrients metabolic waste
products are also removed.
Blood flows slowly due to their small diameter and crucially this is
also where gaseous exchange also occurs.
Under high pressure arteries will carry
blood away from the heart.
Mostly they will transport oxygenated blood
to the tissue and organs, however the
pulmonary artery carries deoxygenated
blood back to the lungs
Small branches of arteries are called Small branches of arteries are called
arterioles Some organs, such as the brain
have a network of arteries known as ‘end
arteries’ meaning once they are blocked,
with a clot the blood supply becomes
compromised.
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