PHGY 209 Lecture Notes - Lecture 9: Arteriole, Osmotic Pressure, Capillary
30 Oct 2016
School
Department
Course
Professor
Document Summary
When the heart pumps, it pumps blood 120mmhg and when it relaxes its 80 mmhg. Some parts of the circulatory system do not exchange molecules through the walls: artery, arteriole, venus, vein. Site of exchange between plasma and isf. Starlings trans capillary dynamics: pressure dissipates along the circularity tract, when it reaches the capillaries, its about 35mmhg, along the capillary bed, the pressure drops even further (15mmhg, two types of forces are at work. Pull force from c. o. p (25mmhg) towards the capillaries: net filtration from heart to capillaries is 10mmhg, net absorption pressure from capillaries to venous is 10mmhg, nutrients, wastes, O2,co2 by simple diffusion across capillaries: starlings trans capillary dynamics determine the distribution of ecf volume between plasma and isf. Size of the arrow is magnitude of the flow: exchanges take place along the whole length of the capillary.
