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Cells and cellular Functions
diffusion, osmosis, hypotonic, hypertonic, transport
15
Biology
9th Grade
01/13/2011

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Term
Hypotonic
Definition
having a lower concentration of solute than another solution
Term
Exocytosis
Definition
Uses a vesicle to move large waste molecules out of the cell.
Term
Endocytosis
Definition
Pinching in to form a vesicle and bring food particles into the cell
Term
Dynamic Equilibrium
Definition
The number of molecules moving in is equal to the number of molecules
moving out.
Term
Osmosis
Definition
Difussion of water molecules across a membrane
Term
Active transport
Definition
Energy is spent to move substances from low concentration to high concentration(Like the Sodium/Potassium pumps in nerve cells)
Term
Plasmolysis
Definition
When the cell loses water due to osmosis, causing the cell membrane to shrink inward
Term
Pinocytosis
Definition
Taking in small particles or fluids by inward pinching of the membrane, creating vessicles.
Term
Passive transport
Definition
NO energy is needed.
Movement of particles across a membrane
Osmosis... Diffusion...
Facilitated diffusion...
Term
Hypertonic
Definition
having a higher concentration of solute than another solution
Term
osmosis
Definition
passive transport of water across a selectively permeable membrane
Term
Isotonic
Definition
having the same concentration of solute as another solution
Term
Facilitated Diffusion
Definition
pathway provided by transport proteins that helps certain molecules pass through a membrane.
Term
Passive Transport
Definition
Diffusion across a membrane requiring only the random motion of molecules with no energy expended by the cell.
Term
Active transport
Definition
Movement of molecules across a membrane requiring energy to be expended by a cell.
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