CAS BI 315 Chapter Notes - Chapter 12: Medulla Oblongata, Left Ventricular Hypertrophy, Secondary Hypertension
7 Jan 2017
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Section a overall design of the circulatory system. Blood: formed elements suspended in a liquid called plasma. Dissolved in plasma large number of proteins, nutrients, metabolic wastes and other molecules. Erythrocytes red blood cells 99% of cells, carry oxygen. Leukocytes white blood cells protect against cancer and infection. Rapid flow of blood throughout the body is produced by pressures created by the pumping action of the heart bulk flow: all constituents move in one direction together. Hemodynamics: relationship among b. p. (mmhg) , blood flow, and the resistance to blood flow, blood flow (f) always from region of higher pressure to lower pressure (l/min, hydrostatic pressure pressure exerted by any fluid. Generated by contraction of the heart: resistance how difficult it is for blood to flow between two points at any given pressure difference the measure of friction that impedes flow. Flow rate is directly proportional to the pressure difference between two points and inversely proportional to the resistance.
