BIO SCI E109 Lecture Notes - Passive Transport, Homeostasis, Red Blood Cell
2 Mar 2014
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Chapter 5: membrane dynamics: useful to think of body in terms of compartments . Cell membranes separate into two major fluid compartments. Intracellular fluid: inside cells; yellow in picture and inside red blood cell; not spatially continuous; a sum of a whole bunch of cell fluids (icf) +plasma: inside the blood vessels (red pathway) but outside the red blood cells. *be familiar with milli, micro, mega moles conversions. Solute: dissolved in the solvent; the key consists of the solutes and the water is the solvent. Intracellular fluid: k+ is primary cation and proteins are primary anions. Interstitual fluid and plasma: na+ is primary cation, but very little k+. Mnemonic to remember na+ and cl- concentration differences across cell membranes cell. [na+] and [cl-] are higher out of the cell than inside the. Imagine a salt shaker sprinkling outside the cell. =net charge in a cell is close to 0 (electrical neutrality)
