NTS 135 Lecture Notes - Fluid Compartments, Extracellular Fluid, Osmosis
Document Summary
What happens to fluid in the cells when the concentration of sodium in the blood is higher than the concentration of sodium inside the cells: electrolytes regulate fluid balance. Primary extracellular ions: sodium (na+, chloride (ci-) Primary intracellular ions: potassium (k+, phosphate (po4-) Intracellular fluid: water found inside the cell, accounts for 63% of body fluid. Extracellular fluid: water outside the cell is located in either interstitial fluid, the fluid between cells (30%) fluid portion of blood (plasma) and lymph (7%) Ions dissolve in water: positively (+) or negatively (-) charged. Ion concentration controls how much water is inside vs. outside of cells. Electrolytes: charged ions that transfer electrical current: controlling ion concentration. Osmosis: passage of water through a membrane from less concentrated compartment to more concentrated compartment, used by digestive tract to absorb water from colon. Hypertonic: high concentration of solutes, figure 9-10: effects of various ion concentrations on human cells.
