HSCI 211 Lecture Notes - Lecture 8: Red Blood Cell, Skeletal Muscle, Sphygmomanometer
13 Apr 2018
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Document Summary
Capillaries are less than 0. 1 mm from cells. Lumen is slightly bigger than a red blood cell. Venous blood flow blood begins at low pressure and is moved up by skeletal muscles and respiratory pump. Edema swelling; accumulation of fluid in interstitial space and varies with capillary exchange. Factors affecting blood pressure: blood volume (raise intake of fluids or blood loss, arterial-venous blood distribution, heart pump effectiveness, resistance in blood vessels. Measuring devices for bp: sphygmomanometer, stop blood flow, releases pressure, first sound = high pressure (systolic) still pressure (diastolic, no sound = relaxed ventricles, aneroid nanometer, digital devices, ambulatory bp monitors. Hypertension abnormally high bp; state of psychological stress: vessels: damages endothelial wall; promoting plaque, heart: increases strain, lead to hypertrophy and cause pulmonary edema and congested heart failure. Treatment: lifestyle management, reduce salt intake, weight, alcohol intake, change diet high fruit and veggies, stop smoking, drugs, diuretics to reduce blood volume, calcium channel blockers, raas.
