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17 Cards in this Set
- Front
- Back
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What is diffusion?
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Random movement of molecules over short distances (accross a cell membrane) due to a pressure gradient. = PASSIVE TRANSPORT...no energy/ATP necissary to perform this.
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What are three things that affect permeability constant?
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Thickness: (the thicker, the harder it is for things to pass through)
Temperature: the colder, the slower the passage through the CM,the warmer, the faster the movement through the CM Type of molecule: some molecules have a higher permeability constant than others (lipid/non-polar mol.) |
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are lipids soluble, or insoluble?
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soluble. (they can be dissolved...)
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what kind of molecule passes easily through CM?
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non-polar molecules...
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does water penetrate through the CM by diffusion?
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NO
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what is the diameter of a pore/channel?
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7-8 Angstroms.
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if a molecule is electrically charged, is it easier or harder for it to pass through CM by DIFFUSION?
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harder. the charge makes it harder because the intra fluid is (-) charged, and like charges repel..
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If water doesn't pass through the CM by diffusion, then how does it cross the membrane?
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Osmosis.
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what does HYPERTONIC mean?
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high pressure
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HypOtonic?
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low pressure/tensions
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Isotonic?
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equal tension.
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how do glucose and Amino acids penetrate the CM?
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Mediated transport...requires a mechanism to transport objects.
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Why do transports compete for an oppurtunity to transport?
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because there are 5 transports for 20 kinds of AA's...so it's a battle to see who gets used..."Transport Olympics"
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what is a COUNTER TRANSPORT?
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2 transports working in opposite directions.
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What is important about Tumeric that I need to know
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it's a spice from India..it allows particular proteins to work....its a treatment for CYSTIC FIBROSIS
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what is the RMP of Potassium?
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-90 mV
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what is the RMP of Sodium?
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+60 mV
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