NRSG 4502 Lecture Notes - Lecture 6: Total Body Surface Area, Central Venous Pressure, Oral Rehydration Therapy
18 Mar 2016
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Document Summary
Body fluids composed of intracellular fluid (icf) and extracellular fluid (ecf). Ecf- has 3 components: intravascular - blood vessels. Total body water - 45-75% of total body weight. Newborn- 40-50% body fluid is in the ecf. Toddler- 30% or < is in the ecf. Hydrostatic pressure: pumping action of the heart increases fluid pressure in arterial portion of circulatory system, forcing fluid through capillary walls. Osmotic pressure: physical force, or pull , created by a solution of higher concentration across a semipermeable membrane. Diffusion: random movement of molecules from a region of greater concentration to regions of lesser concentration. Active transport: a substance is transported by way of a carrier substance against a pressure gradient, from a region of lesser or equal concentration to a region of equal or higher concentration. Vesicular transport: a portion of a membrane engulfs a large molecule and releases it on the other side of the membrane.
