DEFINITIONS AND KEY POINTS of CELL: Plasma membran & Cytoplasm

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TERMS	DEFINITIONS
Homeostasis	The maintenance of a constant internal environment despite fluctuations in the external environment is called homoeo stasis.
Diffusion	The movement of molecules from the area of higher concentrationto the area of lower concentration is called simple diffusion.
Facilitated diffusion	The movement of molecules through the protein molecules from higher to lower concentration is called facilitated diffusion.
Osmosis	The diffusion of water across a selectively permeable membrane from an area of higher concentration to an area of lower concentration is called osmosis.
Tonicity	The relative concentration of solutes in the water inside and outside the cell is called tonicity

Active transport	The movement of molecules form the area of lower concentration to the area higher concentration by the expenditure of energy is called active-transport.
Endocytosis	The bulk movement of material into the cell by formation of vesicle is called endocytosis.
Cytoplasm	The living content of the protoplasm between ---------------------------- ---------------------------- plasma membraneand nucleus is called cytoplasm.
True solution	The small moleculesand ions form true solution. The molecules present in the form of true solution are glucose, some amino acids. soluble salts, ions etc.
Colloidal solution	Some large molecules form colloidal solution. Colloidal solution is present in two forms.
Sol	Non-viscous colloidal solution is called sol. It is present in liquid form.
Gel	The viscous colloidal solution is called gel. It is presentin the formof semi-solid. ‘lite peripheral part of cell is often like a gel.

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