blood vessels Flashcards
function of the arteries
carry blood away from the heart
usually carry oxygenated blood
structure of the wall of arteries
thick and strong
contains muscles and elastic tissues
width of the lumen of arteries
relatively narrow
function of the capillaries
supply all cells with their requirements
take away from waste products
structure of the wall of the capillaries
very thin
only one cell thick
width of the lumen of the capillaries
extremely narrow
wide enough or red blood cells to pass through
function of the veins
carry blood towards the heart
normally deoxygenated blood
structure of the wall of veins
quite thin
contain lesser amounts of muscles and elastic tissues than arteries
width of the lumen of the veins
wide
contains valves
how does arteries fit its function
strength and elasticity needed to withstand blood at a higher pressure as it is pumped through the heart. the elastic tissue allows it to expand and recoil as the ‘bulge’ of blood pass this can be felt as a pulse
small lumen maintains pressure so the blood flows faster
how does capillaries fits functions
no need for strong walls as most of the blood pressure has been lost. no muscle or elastic tissue
thin walls(one cell thick) and narrow lumen bring blood into close contact with body tissues. Allows exchange of substance by diffusion with body cells.
how do veins fit its function
no need for strong wall as most blood pressure has been lost
wide lumen offers less resistance to blood flow
valves prevent backflow
heart - artery and vein
aorta to body
pulmonary artery to lungs
pulmonary vein froms lungs
vena cava from body
lungs - artery and vein
pulmonary artery and pulmonary vein
kidney - artery and vein
renal artery and the renal vein
