Movement of Substances/Plasma Membrane Flashcards
What does passive mean in regards to movement through plasma membrane?
Does not require cellular energy output
What do passive mechanisms depend on?
Internal energy of moving particles and application of external force
The 4 methods of passive movement
Diffusion, facilitated diffusion, osmosis, filtration
What is diffusion?
Movement of molecules from areas of higher concentration to areas of lower concentration
Which substances are simple diffusion limited to?
lipid-soluble substances
What is facilitated diffusion?
Movement through plasma membrane via simple diffusion but with aid from transporters
Example of facilitated diffusion
Glucose
What is osmosis?
Diffusion of water through a semipermeable membrane
In terms of solute and solvent, describe osmosis.
Water(solvent) moves to area of lower (solute) concentration
What is osmotic pressure?
The pressure needed to counteract osmosis
The term osmotic pressure is used to describe what tendency?
The tendency for a solution to draw water in
What are isotonic solutions ?
Solutions that have the same amount of concentration equal to cytoplasm
What are the two IV solutions used to replace body fluids and what are their percentages>?
Saline .9% and dextrose 5%
Solution less concentrated than intracellular fluid
hypotonic (swollen blood cell)
A cell that draws in too much fluid
hemolysis
