NUTR 30300 Lecture Notes - Lecture 8: Fluid Balance, Semipermeable Membrane, Action Potential
28 Oct 2018
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Document Summary
The body fluid composition of tissue varies by. Tissue type-lean tissue have higher fluid content than fat tissues. Gender- males have more lean tissue and therefore more body fluid. Age-lean tissue is lost with age and body fluid is lost with it. Dissolved molecules including charged particles or ions. Charged ions transfer electrical current and are called electrolytes. Ions dissolved in water readily and are either positively (+) or negatively (-) charged. Water is an excellent solvent because it can dissolve many different substances. Blood volume is the amount of fluid in the blood. Decreases blood volumes can cause low blood pressure. Increased blood volume can cause blood pressure to rise. Water movement follows the concentration of dissolved molecules, moving by osmosis to areas where the concentration of electrolytes is high. This allows for the controlled movement of fluids into and out of cells. Diffusion of water through a semi-permeable membrane to equilibrate dissolved particle concentration on each side.
