KN 252 Lecture Notes - Lecture 8: Pulse Pressure, Cardiac Muscle, Great Vessels

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15 May 2017
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Cardiac cycle regulation how blood is pumped. The heart uses 3 principles in order to move blood through itself and the circulatory system: Pressure/flow all things flow from high pressure to low pressure (where the heart accumulates high pressure, it will flow to an area of lower pressure) Elasticity it is stretchable; its shape/volume will change depending on the relative pressure of material inside the heart versus that which is outside the heart (more stretch = more recoil) Mass balance what goes in must come out; as blood enters the heart it will soon leave the heart through the great vessels. Systole period when the heart muscle contraction; creates high pressure in chamber. Diastole period when the heart muscle relaxes; drops pressure in chamber. Diastole (low pressure environment: atrial diastole (atrial filling) chamber stretches as blood fills (occurs before ven. Dia: ventricular diastole (ventricle filling) chamber stretches as blood fills.

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