Physio-sodium potassium pump
Terms
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- What is diffusion?
- 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.
- 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.) - are lipids soluble, or insoluble?
- soluble. (they can be dissolved...)
- what kind of molecule passes easily through CM?
- non-polar molecules...
- does water penetrate through the CM by diffusion?
- NO
- what is the diameter of a pore/channel?
- 7-8 Angstroms.
- if a molecule is electrically charged, is it easier or harder for it to pass through CM by DIFFUSION?
- harder. the charge makes it harder because the intra fluid is (-) charged, and like charges repel..
- If water doesn't pass through the CM by diffusion, then how does it cross the membrane?
- Osmosis.
- what does HYPERTONIC mean?
- high pressure
- HypOtonic?
- low pressure/tensions
- Isotonic?
- equal tension.
- how do glucose and Amino acids penetrate the CM?
- Mediated transport...requires a mechanism to transport objects.
- Why do transports compete for an oppurtunity to transport?
- because there are 5 transports for 20 kinds of AA's...so it's a battle to see who gets used..."Transport Olympics"
- what is a COUNTER TRANSPORT?
- 2 transports working in opposite directions.
- What is important about Tumeric that I need to know
- it's a spice from India..it allows particular proteins to work....its a treatment for CYSTIC FIBROSIS
- what is the RMP of Potassium?
- -90 mV
- what is the RMP of Sodium?
- +60 mV