BIO SCI E109 Chapter : Physiology Complete Textbook Notes.docx
26 Mar 2014
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Intracellular fluid (icf): fluid compartment within cells, high [k+], low [na+] Extracellular fluid (ecf): composed of 2 subgroups, plasma: the fluid portion of the blood, lies within the circulatory system, interstitial fluid: lies between the circulatory system and the cells, high [na+], low [k+] Page: 2: mass flow = concentration x volume flow, homeostasis, refers to the stability of the body"s ecm (plasma and interstitial fluid). : diffusion directly across a lipid bilayer: properties of molecules that can diffuse thru lipid bilayer, small, hydrophobic (lipophilic, properties of simple diffusion, fick"s law of diffusion surface area x concentration gradient x membrane permeability. Membrane thickness: membrane permeability influenced by, size of diffusing molecule. Page: 3: lipid solubility of diffusing molecule, composition of lipid bilayer, cholesterol slows, protein channels accelerate, flux: diffusion rate per unit surface area of membrane, flux = conc. gradient x membrane permeability.
