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Physio Ch. 12 C

artery structure conducting(function of arteries - like an interstate) or elastic arteries (composition of walls)or distributing/ muscular arteries and arterioles
arteries have a high...and are able to... elastic content...recoil (snap back to keep flow of blood continuous)
during recoil... buffer pressure changes and flow is maintained during heart diastole
distributing or...have higher... muscular arteries..smooth muscle content
distributing or muscular arteries have what sort of functino regulatory (vasodilation and constriction)
arterioles have...content smooth muscle
arterioles regulatory function is to... vasodilate and vasoconstrict
metarterioles and precapillary sphincters regulatory function is to... direct flow to or away from caps
arterial blood pressure involves compliance and systolic v diastolic pressures
compliance occurs all over, not just in the heart
compliance is the ability of the structure to stretch (how easily)
compliance = delta volume/delta pressure
^ volume or stretch w/ little change in pressure > ^ compliance
Decreased compliance occurs bec of ^ volume or stretch with big change in pressure
systolic pressure is the result of...and diastolic pressure is the result of... systole of vents...diastole of vents
arterial blood pressure is determined by systolic pressure/diastolic pressure (max pressure/min pressure)
start of pre-hypertension is what value 120/80 mm Hg
pulse pressure is SP - DP (120-80 mm Hg = 40 mmHg)
factors affecting pulse pressure include stroke volume (systolic > ^ PP), compliance (systolic > ^ PP as a result of arteriosclerosis), ejection velocity (increase contractility and ejection of blood = systolic > ^ PP as a result of exercise)
arterial blood pressure also includes mean systemic arterial pressure (MAP)
map is the average pressure in arteries
map = DP + 1/3 pulse pressure or 1/3(SP + 2DP)
map is the driving pressure behind blood flow into tissues
MAP is ..throughout the body consistent
measurement of blood pressure through sphygmomanometer and stethoscope, laminar flow (quiet) and turbulent flow (listen for when blood flows again)
turbulent flow means you can hear what sounds korotkoff's (1st = systolic pressure, 2nd = diastolic pressure)
arteriole structure smooth muscle to regulate diameter
arteriole variable resistance includes vasodilation, vasoconstriction and the ability to alter resistance allowing regulation of blood flow
vasodilation >...its effect on resistance and on flow? ^ diameter...decrease, increase
vasoconstriction > ..its effect on resistance and flow? decreases diameter...^ and decrease
Created by: handrzej



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