Physiology 2130 Study Guide - Midterm Guide: Fluid Compartments, Extracellular Fluid, Cell Membrane
20 Sep 2016
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Make a simple diagram of two cells and a nearby capillary. Label the intracellular fluid compartment, extracellular fluid compartment, interstitial fluid compartment, plasma, and cell membrane. Indicate the relative size of each of the compartments in terms of percent of total body water. Describe the chemical composition of the intracellular fluid, interstitial fluid, and plasma in terms of sodium, potassium, chloride, and proteins. (you do not need to memorize the exact amount, just their relative levels. ) Intracellular fluid: high in k+ compared to extracellular compartment. Extracellular fluid: high in na+, cl- and ca2+ compared to intercellular compartment. Plasma: high in ca2+, and protein ions compared to interstitial fluid. Interstitial fluid: high in na+, k+, and cl- compared to plasma. Explain what accounts for the differences in chemical composition of the intracellular and interstitial fluids and plasma. Cell membrane: is selectively permeable so some ions go through membrane more easily than others. Basis of selective permeability: channels, pores, transport systems.
