CVS physiology 6 - presure nd flow in arters and veins Flashcards
what are korotkoff sounds
sound when the blood is being tourbuald
what are hte disandves of manula blood ressure
discountis - can’t be measured constanlty
accuracy - needs regular calibarion and different from person to person
skilled
what are the advantages of manaul blood prssure
non invasive and cheap
what happens to blood pressure reading if the cuff is too large
underestimate
what happens if the blood pressure cuff is too small
over estimate
how does a automatic blood pressure machine work
the turbulanet flow sets up vibrations, the transueseer monitors the vibration, the maximum vibration occur at the mean arterla pressure, an algorithm estimate the diastoci and systolic pressures
what happens to the blood in venticalr contation
pushes it into aorta and this streches the walls of ti
what happens to blood during venticlur relaxiont
the blood leaves the aortora, slow asthe vessel have elastic recoild
what 4 factors effects pressure flow
stroke volume, veloicty of ejection, elasticy of arteries, total peripheral resitance
how does stroke volume effect pressure
as more blood is being pumped out, greater forces is being required thus increase in pressure
how does veloicty of ejection effect pressure
with larger risign phase, less time for the walls of the aeorta to stretch, thus higher systolic volume and lower dystolic volume
how does elasticicty of arteries pressure wave volume
loss as age, thus less able to spread pressure evently, thus more flow all at once
how does total resure resant effect
if arteoles are contrest, tpr will be higher, then more gradium falling paht and higher disaltoic pressure
what happens to arterail pressure with age
incresae
what happens to blood pressure thogu the day
it chanes cloisn, lower durign sleep
what happen as blodo goes int thea areis and what is it
small drop , but only small as they are low resistance, 95 to 90mmg
what happens toblodo rpessure as they go to teh aeortieols and what is it
large drop as they are resianct vessles, 90 to 40mmhg
what happens blood pressure when it goes from cappie to veins and what is it
only allitle bit left
5- 20mmgh
where is teh velocity of blood highest
aorta
where is teh veloicty of blood the lowest
cappilare, veain and arteilies
why is the veloicty of blood higher in teh aorta and vena cava
it has lower corss sectional area
why is the velocity of blood lower in teh cappiles
higher cross scional rea
what is teh effect of gravity on blood vessls
pulls blood down, cauing it to swell in the feat,
what is teh effect of gravty on the heart
reduced edv, reduced prelaod, reduced sv, reduced co reduced map
