BIOL 1119 Lecture 7: Cardiac Cycle Lecture 7 notes
19 Aug 2016
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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 the great vessels. 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 (on the arm) Flow occurs when a fluid subjected to more pressure at one point than another. Pressure gradient: pressure difference between two points. Pressure is inversely proportional to the volume of a container. A heart chamber such as the left ventricle is like a syringe barrel. Blood is ejected into the aorta or pulmonary.
