3 main blood vessels Flashcards
what does the artery do
carry blood away from heart
what do capillaries do
the are in charge of exchange of materials at tissues
what do veins do
carry blood into heart
describe walls in capillaries
one cell thick, they are PERMABLE
what type of blood does the capillary bring
oxygenated and deoxygenated
why are capillaries one cell thick
increases rate of diffusion which decreases the distance it has to travel
what do capillaries supply
food and oxygen
describe the walls of the arteries
strong and elastic (thick)
why are the walls of the arteries built like this
to able to withstand the high pressure of blood flow
what do veins have inside them
valves
why do veins have valve
to stop backflow and to make sure that the flow of blood is going the right way
why does the wall on the veins doesnt have to be thick as the arteries
because they are transporting blood at a low pressure
