Topic 3B- More Exchange and Transport Symptoms Flashcards
what vessel carries blood away from the heart
arteries
do arteries have thick walls
yes
what type of blood do arteries carry
oxygenated
what is the only artery that carries deoxygenated blood
pulmonary artery
what do arteries divide up into
arterioles
what do the muscles in arterioles do
control direction where blood is demanded
what is the widening of the lumen
vasodilation
what is the lumen getting smaller
vasoconstriction
where do veins carry blood to
back to the heart
do veins have a small lumen
no, it’s wider than arteries
what has more elastic tissue for stretch and recoil to maintain pressure
arteries
do veins have valves, if so why
yes, to prevent backflow when going against gravity to the heart
what type of blood do veins carry
deoxygenated
do veins have muscle surrounding them, if so why
yes, this is to aid the low pressure blood back to the heart against gravity
what do arterioles branch into
capillaries
what is the smallest blood vessel
capillaries
why are capillary’s good for exchanging substances between cells and capillaries
they are 1 cell thick