IMG_0024 - wave passes through walls experience higher P...

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b" Blood viscosity Yiscosity is the thickness of the fluid. If viscosity increases (molecules slide past one another less easily) ) R increases ) P increases to move the fluid along. The viscosity is directly afficted by: 1. Hematocrrt:Yo ofRBC in the total blood volume. Increases if more RBC or less plasma Decreases if fewer RBC or more plasma 2. Amount of fluid: removing fluid increases the viscosity c. Total vessel length If there is an increases amount of fatty tissue ) requires more vessels to serve it F total vessel length increases F greater R ) greater P Yessel Elasticity Healthy arteries with systole expand and recoil with diastole ) continuous Q Arteriosclerosis - arteries calcified and rigid F can not expand when the systolic
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Unformatted text preview: wave passes through ) walls experience higher P ) walls weaken Blood Yolume Excessive salt intake ) water retention ) blood volume increases ) more fluid presses against the walls ) walls experience greater P (compensatory mechanisms return this situation to normal) Excessive sweating ) blood volume decreases ) P against the walls decreases (but only short term because there are homeostatic mechanisms to compensate) Cardiac Output If CO decreases ) P decreases because less P on walls If CO increases F P increases because more P on walls Anything which affects HR or SV will affect the CO (recall: CO : HR x SV). and the CO in turn, affects the BF g7...
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