Phys Ch 6
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Phys Ch 6
Physiology Chapter 6
Mixture of 2 or more compounds
component of a solution that which is of the greatest amount
Component of a solution that which is of a lesser amount
Define concentration gradient
Difference/change between solute and solvant
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)?
Ability of molecule to travel across plasma membrane
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
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 10
Formula for molarity
1 Mole of Particle/1 L water
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
Osmotic pressure; pulling force of water; tension
Same osmotic pressure
In medicine, isotonic refers to the osmolarity of what?
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 either
1. Thirst -> drinking -> increase in water intake
2. ADH from posterior pituitary -> carried via blood to kidneys -> remove salt to increase water retention
How do large polar molecules get across plasma membrane?
What are 3 properties of carrier mediated transport?