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Humitz Cell Transport
Cell Transport
15
Biology
9th Grade
11/10/2009

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Term
Diffusion
Definition
is the movement of a substancefrom an area of high concentration to an area of lower concentration.
Term
osmosis
Definition
The diffusion of water into or out of a cell.
Term
A cell will become enlarged when it is placed in a
Definition
hypotonic solution
Term
The sodium-potassium pump usually pumps what in and what out?
Definition
potassium ions into the cell and sodium out.
Term
endocytosis
Definition
movement of molecules that are too large to be moved through the membrane into the cell
Term
exocytosis
Definition
Movement out of a cell of molecules that are too large to be moved across a cell membrane.
Term
Plasmolysis
Definition
occurs when a cell shrinks due to water loss.
Term
isotonic environment
Definition
the amount of water entering the cell will equal the amount of water exiting the cell
Term
Passive transport
Definition
does not require energy from the cell
Term
Concentration gradient
Definition
difference in the concentration of molecules across a space
Term
Equilibrium
Definition
concentration of molecules is equal throughout a space
Term
movement of a substance down the substance’s concentration gradient
Definition
Diffusion
Term
causes a cell to shrink because of osmosis, movement out of a cell
Definition
Hypertonic solution
Term
Facilitated diffusion
Definition
passive transport using carrier proteins
Term
Active transport
Definition
movement of a substance against the substance’s concentration gradient
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