Forces Acting Across Membranes 3 Flashcards
Define osmosis.
The net movement of water from regions of high concentrations to low. It dictates fluid balance in the body and is necessary for the body to function
Water concentration is the _____ of solute concentration.
Inverse
How does water affect concentrations in the cell?
Water can diffuse through the selectively permeable membrane until the concentration of solute is equal on both sides of the membrane by diluting the more concentrated side.
Define osmotic pressure.
Pressure that must be applied to oppose osmosis
What defines osmotic effect on water concentration?
Solute particles.
Define osmolarity.
Defines the concentration of biological solutions in units of osmoles.
What is normal human plasma osmolarity?
285/300 mOsmol/l
What acts as non-penetrating molecules in ECF?
Sodium and chlorine.
What acts as non-penetrating molecules in ICF?
Potassium and organic anions.
Define tonicity.
Describes the number of non-penetrating particles in solution.
Define isomotic.
Solution has the same total number of solute particles as ECF.
Define hyperosmotic.
Solution has more solute particles than ECF.
Define hypoosmotic.
Solution has less solute particles than ECF.
Define isotonic.
Solution has the same number of non-penetrating solute particles as ECF.
Define hypertonic.
Solution has more non-penetrating solute particles than ECF.
