BIOL 1119 Lecture Notes - Lecture 7: Ejection Fraction, Pulmonary Circulation, T Wave
1 Feb 2017
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Fluid is a state of matter; moves in bulk or in mass from one point to another. 2 variables affect flow: pressure moves fluid, resistance opposes flow. Ventricular pressure must rise above resistance for blood to flow into great vessels. Pressure measured with manometer: atmospheric pressure is measured by how high it pushes a mercury column up the tube of a manometer (mmhg, blood pressure measured with sphygmomanometer. Pressure causes a fluid to flow: flow occurs when a fluid experiences more pressure at one point than anther, pressure gradient: pressure difference between two points flows down gradient. Inversely proportional to volume of a container: left ventricle: syringe barrel. When ventricle is expanding, pressure falls: blood flow into ventricle. When ventricle contracted, pressure rises: blood ejected into aorta or pulmonary trunk. Pressure changes determine opening and closing of valves (tendinous cords do not): bc valves have no muscle and are passive.
