Diffusion and Osmosis

31 terms by mikeblauvelt 

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Vocab

Diffusion

process by which molecules spread from an area of greater concentration to less concentration

Concentration Gradient

differences in concentration of a substance across space

Equilibrium

state that exists when concentration of a substance is the same throughout space

when is an object permeable to a membrane?

if the substance can move across it

can all molecules diffuse across a membrane?

no depends on size and shape

Osmosis

process by which molecules spread from an area of greater concentration to less concentration in water

Solute

substance that dissolves in solution

Hypotonic

concentration of solute molecules outside cell is lower than concentration inside

Hypertonic

concentration of solute molecules outside cell is higher than concentration inside

Isotonic

molecules diffuse in and out at equal rates

Turgor Pressure

pressure that h2o molecules exert against cell wall

Plasmolysis

when cells shrink away from cell walls-turgor pressure is lost

Cytolysis

bursting of cells

Endocytosis

process by which cells ingest cyternal fluid and large particles

Pinocytosis

transport of fluids

Phagocytosis

movement of large particles

Active Transport

Cells must move materials up their concentration gradient

Sodium-Potassium Pump

Carrier proteins transport Na+ ions and Kt ions up their concentration gradient

Carrier Proteins

binds to the molecules it transports.

Facilitated Diffusion

molecules that cannot diffuse rapidly through cell membranes even when there is a concentration gradient-molecules are assisted by carrier proteins

Metabolic Rate

amount of energy used in certain period

Solvent

substance that dissolves another to make a solution

Does temperature effect diffusion?

Yes, warmer it is the faster diffusion takes place

Semipermeable Membrane

a pliable tissue which allows some materials to pass but stops others

Turgor

describes how rigid plant cells are due to pressure of water they contain

Thermal Equilibrium

two substances in physical contact with each other exchange no heat

Dynamic Equilibrium

constant action but the result in the action has no change

Basil Metabolic Rate

resting rate

Exocytosis

process by which material is exported from a cell

Phospholipids

various compounds composed of fatty acids and phosphoric acid and a nitrogenous base

ion channel

passageways through cell membrane

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