# Phys Ch 6

 Define Solution Mixture of 2 or more compounds Define solvent component of a solution that which is of the greatest amount Define Solute Component of a solution that which is of a lesser amount Define concentration gradient Difference/change between solute and solvant Define diffusion The random thermal motion of particles. Molecules move faster as temperature increases. What kind of molecules can easily move through a plasma membrane? Small and non-polar molecules. What molecule is an exception of to (small and non-polar molecules easily moves across plasma membrane)? Define permeability Ability of molecule to travel across plasma membrane Define osmosis Diffusion of water across a membrane What are two methods molecules can be helped across the membrane? Ion channels & protein carriers Why are ion channels called gates? Because they open and close Define osmotic pressure Pulling force of a solution for water Define Molarity Unit of concentration , ratio of solute to water(grams/Liter of water) What is one gram molecular weight? For Glucose? Sucrose? NaCl? Molecular weight of a particle. Glucose =180, Sucrose = 342, NaCl= 58.5 What is 1 mole? 1 gram weight of a particle. 6.02 x 1023 (Avagadro's number) Formula for molarity 1 Mole of Particle/1 L water Define osmolarity Molarity x # of particles of dissociation. The units for osmolarity is Osmols What is molarity of our body fluids? Our osmolarity? p.15M ; 0.30 Osm Define Tonicity Osmotic pressure; pulling force of water; tension Define isotonic Same osmotic pressure Define isosmotic In medicine, isotonic refers to the osmolarity of what? body fluids How to make isotonic solution of NaCl? .3 osm/2 = .150 M; .150M x 58.5 = roughly 9 grams of NaCl/1L water Define regulation of blood osmolarity During dehydration, through negative feedback, osmoreceptors in hypothalamus determines either1. Thirst -> drinking -> increase in water intakeor2. ADH from posterior pituitary -> carried via blood to kidneys -> remove salt to increase water retention How do large polar molecules get across plasma membrane? facilitated diffusion What are 3 properties of carrier mediated transport? Authorfckillpass ID40572 Card SetPhys Ch 6 DescriptionPhysiology Chapter 6 Updated2010-10-08T00:45:40Z Show Answers