BIOL 031 Lecture Notes - Lecture 29: Coronary Circulation, Vasoconstriction, Blood Vessel
19 Aug 2020
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Why does blood ow? because liquids and gases ow down pressure gradients from regions of high pressure to regions of lower pressure. Blood can ow in the cvs only if one region develops higher pressure than other regions the heart creates high pressure when it contracts. Pressure falls continuously as blood moves farther from the heart. Highest pressure points in the cvs are at the aorta and systemic arteries where they receive blood from the left ventricle. The pressure of fluid in motion decreases over distance. Pressure (in uid): the force exerted by the uid on its container. Hydrostatic pressure: the pressure exerted when uid is not moving and force is exerted equallyin all directions. When uid is owing, pressure falls over distance as energy is lost because of friction. Pressure changes in liquids without a change in volume. Pressure created by the contracting muscle is transferred to the blood.
