BIOL 3096 Chapter Notes -Micelle, Phagocytosis, Cyclic Nucleotide
3 Mar 2014
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Ions, certain sugars, water (aquaporin in plasma membrane and porin in mitochondria) flow through these channels. Without these channels, flow through the membrane of these substances would be greatly slowed: for channels, thus facilitated diffusion, you will reach a saturation point. 10/14/13: frequently called pumps, these channels require additional energy, na+k+ atpase pump, exchanges three na for two k, na binds to channel, atp is hydrolyzed to adp, phosphate attaches to channel, changes channel configuration, allows. Na to release, then k is bound, phosphate releases, channel reverts to original configuration, releases k and binds to na again. Na leaves cell, k enters cell: proton pump pumps h+ across membrane, changes ph of the internal vessel, especially found in lysozomes, calcium pumps pump ca2+ into muscle, found in the sarcoplasmic reticulum. The predator cell forms a balloon of plasma membrane around the victim cell, drawing the opening closed like a drawstring purse.
