BIOL 1119 Lecture Notes - Lecture 4: Heart Valve, Heart, Blood Pressure
3 Oct 2017
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Principles of pressure and flow: a fluid is a state of matter, moves in bulk or in mass from one point to another (also, gases are fluid-like, two main variables affect flow: Ventricular pressure must rise above resistance for blood to flow into great vessels: pressure measured by manometer. Atmospheric pressure is measured by how high it pushes a mercury column up the tube of a manometer (in units of mm hg) Pressure is thus measured in millimeters of mercury (mm hg) Blood pressure is usually measured with a sphygmomanometer: pressure causes a fluid to flow. Flow occurs when fluid experiences more pressure at one point than at another. Pressure gradient: pressure difference between two points. Cardiac cycle- is one complete contraction and relaxation of all four heart chambers; the cardiac cycle has four phases, all of which are completed in less than.
