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Physio Ch. 12 C
Question | Answer |
---|---|
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 |