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Homeostasis and Transport
Homeostasis and Transport
23
Biology
Not Applicable
09/26/2005

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Term
Selectively Permeable
Definition
Allows certian materials to enter
Term
Homeostasis
Definition
The stable internal condition of a living thing
Term
Protein Channel
Definition
Facilitated diffusion utilizes membrane protein channels to allow charged molecules (which otherwise could not diffuse across the cell membrane) to freely diffuse in a nd out of the cell
Term
Turgor Pressure
Definition
Pressure of the cell membrane pushing on the cell wall
Term
Plasmolysis
Definition
The shrinking or wiltering of a walled cell in a hypertonic environment
Term
Cytolysis
Definition
The bursting of a cell
Term
Hypotonic
Definition
Describing a solution whose solute concentration is lower than that inside a cell
Term
Hypertonic
Definition
Describing a solution whose solute concentration is lower than inside the cell
Term
Isotonic
Definition
Describing a solution whose solute concentration equals that of the inside of the cell
Term
Solute
Definition
A substance dissolved in a solution
Term
Solvent
Definition
The material that dissolves the solute
Term
Diffusion
Definition
The process by which molecules move from an area of greater concentration to an area of lesser concentration (Passive Transport)
Term
Facilitated Diffusion
Definition
A process in which substances move down their concentration gradient across the cell membrane with the assistance of carrier proteins (Passive Transport)
Term
Ion Channel
Definition
A membrane protein that allows specific ions to move into or out of a cell along concentration graniet (Passive Transport)
Term
Sodium Potassium Pump
Definition
A carrier protien that activly transports 3 sodium (Na+) out of the cell, and 2 potassium (K+) into the cell (Active Transport)
Term
Osmosis
Definition
The diffusion of water across a selectivly permeable membrane (Active Transport)
Term
Exocytosis
Definition
A process in which a vesicle inside a cell fuses with the cell membrane and releases its contents to the external enviornment (Active Transport)
Term
Endocytosis
Definition
The process by which a cell surrounds and engulfs substances (Active Transport)
Term
Pinocytosis
Definition
A type of endocytosis in which a cell engulfs solutes or fluids (Active Transport)
Term
Phagocytosis
Definition
A type of in which a cell engulfs large particles or whole cells (Active Transport)
Term
Concentration Gradient
Definition
Concentration diffrence across space
Term
Vesicle
Definition
A membrane sac
Term
Carrier Protiens
Definition
Proteins stuck through a cell membrane that is used to transport large molecules across the membrane
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