BIOLOGY Cell Transport

15 terms by smistry Plus

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homeostasis

metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes; process by which organisms maintain a stable internal environment

concentration

the strength of a solution; the amount of solute dissolved in a solvent

diffusion

the process by which molecules move from an area of higher concentration to an area of lower concentration

osmosis

diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal

concentration gradient

a difference in the concentration of a substance across a distance

equilibrium

equality of distribution; state where there is no net movement of molecules

passive transport

the movement of substances across a cell membrane without the use of energy by the cell

active transport

energy-requiring process that moves material across a cell membrane against a concentration gradient

endocytosis

process by which a cell takes material into the cell by infolding of the cell membrane

exocytosis

the process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to release the substance

solute

the dissolved substance in a solution

solvent

a liquid substance capable of dissolving other substances

positive feedback loop

Situation in which a change in a certain direction provides information that causes a system to change further in the same direction.

negative feedback loop

A feedback loop that causes a system to change in the opposite direction from which it is moving

semipermeable membrane

a membrane (as a cell membrane) that allows some molecule to pass through but not others

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