AQA biology 13.6 blood vessels and their functions

what do arteries do?

what are arterioles and what do they do??

what are capillaries?

which three vessels share the same basic layered structure?

name the basic structures in blood vessels from the outside inwards.

what is the tough outer layer for in a blood vessel?

what is the muscle layer for in blood vessels?

what does the elastic layer in a blood vessel do?

what does the endothelium do in a blood vessel?

what is the lumen?

what is the muscle layer like in an artery compared to a vein?

why is the elastic layer thicker in arteries than veins?

what does the recoil action of the elastic layer in an artery help with?

why is the overall thickness of an artery large?

are there any valves in an artery?

why are there no valves in most arteries?

what are two ways arterioles differ from arteries?

why is the muscle layer thicker in arterioles?

why is the elastic layer thinner in arterioles than arteries?

what are the 4 main structural features of veins?

what are the 5 structural features of capillaries?

capillaries cant serve every cell directly. how does our body counter this?

what 5 components does tissue fluid contain?

tissue fluid supplies cells with certain substances. what does it get in return?

what is tissue fluid formed from?

what is the composition of blood plasma controlled by?

blood is pumped through arteries, then narrower arterioles, then narrower capillaries. what kind of pressure does this create?

what does hydrostatic pressure do to blood plasma?

what to forces is the outward pressure opposed by?

the overall pressure is enough to get some molecules out of the capillaries. what is this filtration called?

how does tissue fluid get back into the capillaries?

what happens to the fluid that doesnt return to the capillaries?

how does fluid move through the lymphatic system?