Part 10
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| plasma membrane | surrounds all living cells; made of phospholipids and proteins; selectively permeable
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| diffusion | movement of molecules down their concentration gradient
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| passive transport | diffusion across a membrane
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| osmosis | difussion of water
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| which way do water diffuse down its concentration gradient? | from high to low concentration
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| osmoregulation | control of water balance
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| hyperosmotic solution | higher concentration of solutes than the cell
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| hypoosmotic solution | lower concentration of solutes than the cell
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| isotonic solution | equal concentration of solutes as the cell
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| why can't ion diffuse through like water? | because its charged
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| active transport | molecules are pumped across a membrane against a concentration gradient
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| 2 type of active transport channel | sodium-potassium pump and proton pump
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| in the sodium potassium pump, what gets pump in, what gets pump out? | Na out, K in
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| proton pump | opump protons across membranes
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| what purprose does a proton pump serve? | manufacture ATP with the power of proton pushing through channels
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| chemiosmosis | protons diffuse back across membrane through channels that use the force of the proton pushing through to make ATP
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| exocytosis | discharge of material from vesicles at the cell surface
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| endocytosis | plasma membrane envelops particles and bring them into the cell interior
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| 3 major forms of endocytosis | phagocytosis, pinocytosis, receptor mediated
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| phagocytosis | engulfment of particulate material
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| pinocytosis | engulfment of liquid material
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| receptor-mediated endocytosis | this is how cholesterol gets into animal cell;
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| how do cell communicate with each other | via chemical signals across their cell membranes
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Or sort by any of the columns using the down arrow next to any column heading.
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