blood vessels Flashcards
what are blood vessels apart of
closed circulatory system
what are the types of blood vessels
arteries
arterioles
capillaries
venules
veins
which vessel carry blood away from heart to body cells
arteries and arterioles
what type of blood do artery and arteriole carry
oxygenated
exc pulmonary artery
which blood vessel carry blood from body cells to heart
venules and veins
what blood do venules and veins carry
deoxygenated
exc pulomary vein
how does blood vessel travel
arteriers, arteriole, capillary, venule,vein
endothelium in blood vessels
inner lining of all blood vessels
made of a single layer of cells
smooth, reduce friction with flowing blood
elastic fibre in blood vessels
made of elastin
provide flexibility, stretch and recoil of vessel
evens out surges from pumping of heart, allow continuous flow of blood
smooth muscle of blood vessels
provide some strength to withstand high blood pressure
contract and relax, change size of lumen, alter flow of blood
collagen in blood vessels
provide structure and support
limit stretch to maintain shape and volume of vessel
function of capillaries
allow exchange of substances by diffusion between blood and surrounding cells
structure of capillaries
one cell thick, short diffusion distance
leaky walls, allow blood plasma and dissolved substances leave blood
travel in single file, increase contact of rbc within capillary walls, reduce diffusion distance
total cross-sectional area is larger than the arteriole supplying them, reduce rate of blood flow from arteriole supplying them, blood moves slow
function of vein
carry blood back into heart
large blood reservoir
structure of vein
larger lumen, reduce friction
thin elastic layer, dont stretch and recoil
little smooth muscle
walls have lots of collagen, provide structural support
valves to prevent backflow of blood
