NURS2080 Study Guide - Final Guide: Hypertension, Hemodialysis, Hemorrhoid
Document Summary
2/3 of body water is within our cells. Fluid can be pulled from extracellular space when needed to help with blood pressure. Fluid in pericardial sac, pleural cavity, peritoneum, sweat, urine, lymph system, etc. Icf & ecf rely on concentration of sodium. Where sodium goes, water follows (osmolality, osmolarity = synonyms) <275 = low osmolality (solution low in solutes dilute) Hypotonic h2o osmotically pulled into cell, swelling. Hypertonic cell shrinks as water is pulled out of cell. Low & high circulating volumes results in feedback mechanisms. Low (hypotensive, fluid lost), body conserves h2o and na+ Located near hypothalamus, they sense osmolality of blood. If [solutes] too high (patient dehydrated), adh and thirst mechanism activated. Located in atria, in large pulmonary vessels, in aortic arch. They sense low or high circulating volume (by stretch of vessels near heart) Gfr goes up due to rise in bp. Both cause kidneys to excrete sodium, water follows.
