PHGY 210 Lecture Notes - Lecture 6: Stethoscope, Hypovolemia, Pulse Pressure
25 Apr 2018
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F = p/ r: flow is proportional to pressure gradient. Inner layer = single layer of endothelial cells surrounded by basement membrane of connective tissue. Middle layer = circular arrangement of smooth muscle sells with some connective tissue. Functions of arteries (2: act as a rapid-transit passageway for blood due to their large radius, act as pressure reservoirs to make sure pressure gradient exists even when the heart is relaxing. During systole blood entering arteries have a greater volume rate than blood flowing through capillaries: blood ejected toward artery walls, transfer pressure to sustain arterial pressure. Healthy individuals have the following systole/ diastole mmhg. Inflatable cuff with pressure gauge and stethoscope: blood flow sounds = korotkoff sounds. Pulse pressure: difference between systolic and diastolic pressure: representative of pressure change during cardiac cycle. Mean arterial pressure (map): average pressure during cardiac cycle: representative of mean driving force for blood flow throughout the vascular system.
