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Biology *****

Part 10

QuestionAnswer
plasma membrane surrounds all living cells; made of phospholipids and proteins; selectively permeable
diffusion movement of molecules down their concentration gradient
passive transport diffusion across a membrane
osmosis difussion of water
which way do water diffuse down its concentration gradient? from high to low concentration
osmoregulation control of water balance
hyperosmotic solution higher concentration of solutes than the cell
hypoosmotic solution lower concentration of solutes than the cell
isotonic solution equal concentration of solutes as the cell
why can't ion diffuse through like water? because its charged
active transport molecules are pumped across a membrane against a concentration gradient
2 type of active transport channel sodium-potassium pump and proton pump
in the sodium potassium pump, what gets pump in, what gets pump out? Na out, K in
proton pump opump protons across membranes
what purprose does a proton pump serve? manufacture ATP with the power of proton pushing through channels
chemiosmosis protons diffuse back across membrane through channels that use the force of the proton pushing through to make ATP
exocytosis discharge of material from vesicles at the cell surface
endocytosis plasma membrane envelops particles and bring them into the cell interior
3 major forms of endocytosis phagocytosis, pinocytosis, receptor mediated
phagocytosis engulfment of particulate material
pinocytosis engulfment of liquid material
receptor-mediated endocytosis this is how cholesterol gets into animal cell;
how do cell communicate with each other via chemical signals across their cell membranes
Created by: Tiffastic
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