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Unformatted text preview: 1 CVP Unit II Study Guide Guyton Outline – Chapters 14,15,16,17,18,19,20,21,83 Chapter 14: Overview of the Circulation; Medical Physics of Pressure, Flow and Resistance main functions of circulation – serve needs of tissues by transporting nutrients to tissues transporting wastes from tissues carrying hormones from one part of the body to another maintaining homeostatic conditions in tissue fluids for optimal survival and function of the cells circulation divided into – pulmonary circulation supplies lungs systemic circulation supplies tissues of the rest of the body functional parts of circulation – arteries transport blood under high pressure to tissues have strong vascular walls & rapid blood flow arterioles last branches of arterial system act as control valves thru which blood is released into capillaries have stong muscular walls that can be constricted or dilated can markedly alter blood flow to capillaries to respond to changing tissue needs capillaries exchange fluids, nutrients, and other substances between blood and ISF have thin walls highly permeable to small molecules venules colelct blood from capillaries gradually merge into progressively larger veins veins conduits to transport blood from tissues back to the heart serve as reservoirs for blood have thin walls, low pressure and rapid blood flow Circulation is a complete circuit: left heart contracts – blood is propelled into systemic circulation thru aorta – empties into smaller arteries, arterioles, and capillaries each contraction distends the vessels during relaxation, the vessels recoil – this continues the flow to the tissues blood leaves tissues – enters velules – flow into larger veins – carry blood to right heart right heart pumps blood thru pulmonary artery, small arteries, arterioles, and capillaries carbon dioxide and oxygen are exchaned pulmonary capillaries flow into venules and larger veins empties into left atrium and left ventricle pumped into systemic circulation Because blood flows around and around the same vessels, any change in flow in a single part of the circuit transiently alters flow in other parts: strong constriction of the arteries can transiently decrease total cardiac output – blood flow to lungs decreases as much as flow thru systemic circulation sudden constriction of a vessel must always be accompanied by opposite dilation of another part of the circulation since blood volume can not rapidly change...
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This note was uploaded on 04/07/2008 for the course CVP 301 taught by Professor Freedman during the Spring '08 term at Palmer Chiropractic.
- Spring '08