PHGY 209 Midterm: Midterm study guide

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By number of solute molecules (molarity and molality) By number of charge units (eq = molarity of ion x valence of ion) 300 mosm = 6. 7 atm = 5100 mm hg. Support distinct compositions of icf and isf. Name 3 of the 6 cell membrane protein functions. Selective transport channel: transport specific molecules into and out of the cell. Cell surface receptor: receive and transduce chemical signals from cell environment. Availability and number of carriers and ion channels. Carrier mediated active transport: primary and secondary. Membrane must be permeable to diffusing particles. Concentration gradient of the diffusing molecule across the membrane. Diffusion time increases at the same rate as the distance. Diffusion time increases in proportion to the square of the distance. The simultaneous existence of an electrical and a concentration gradient for a particular ion is known as an _________ Gating refers to the capacity of ion channels to exist in either open or closed states.

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