BIOC34H3 Lecture Notes - Lecture 8: Hepatic Portal System, Vascular Resistance, Sickle-Cell Disease
30 Jan 2017
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If the percentage of rbc increases, then hematocrit increases. As temperature decreases, blood viscosity will increase. It tends to occur when you have high flow rate and pressure. Turbulent flow, you get back flow of blood. Sickle cell anemia is when blood cells have abnormal shape and they can cause blockage. Things that lead to turbulent flow can lead to a reduction in flow. If you change the radius, you change the resistance to flow. Radius is the variable that is most normally regulated when looking at blood flow because it is very easy to use hormones to cause blood vessels to constrict or dilate. When looking at blood flow in circulation as a whole, we are really talking about total peripheral resistance. Largest drops in pressure occur across the arterioles. Systemic circuit is a high pressure circuit compared to pulmonary. Blood flow through the 2 circuits is the same.
