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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
the process by which molecules move from an area of higher concentration to an area of lower concentration
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
the movement of substances across a cell membrane without the use of energy by the cell
energy-requiring process that moves material across a cell membrane against a concentration gradient
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
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
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