study guide

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Department
Biological Sciences
Course
BIOC34H3
Professor
Stephen Reid
Semester
Winter

Description
Lecture 7 Study Notes Resistance: degree to which blood flow is hindered. 4 factors affecting vascular resistance: Vessel radius: primary regulator of resistance. Greatest influence as to the power of 4 o Smooth muscle regulates vessel radius by dilating or constricting the blood vessel Vessel length Viscosity o Measure of frictionn different fluid layers and also friction with the wall of the blood vessel o Haematocrit: percentage of blood volume occupied by cells The more haematocrit you have, the greater viscosity o If temperature is increased, viscosity decreases (for ever degree, 2% decrease in viscosity
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