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Chapter 7.3 Vocab
Flashcards for Biology 2
11
Science
11th Grade
11/18/2012

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Term
Diffusion
Definition
Movement of a fluid from an area of higher concentration to an area of lower concentration
Term
Concentration Gradient
Definition
he graduated difference in concentration of a solute per unit distance through a solution.
Term
Passive Transport
Definition
a means of moving biochemicals, and other atomic or molecular substances, across membranes
Term
Osmosis
Definition
Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane.
Term
Isotonic
Definition
having the same osmotic pressure, commonly having physiological osmotic pressure
Term
Osmoregulation
Definition
The process of regulating water potential in order to keep fluid and electrolyte balance within a cell or organism relative to the surrounding.
Term
Turgid
Definition
Swollen or distended, as from a fluid
Term
Flaccid
Definition
Lacking vigor or energy
Term
Facilitated Diffusion
Definition
Transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration by means of a carrier molecule
Term
Ion Channels
Definition
A single protein or protein complex that traverses the lipid bilayer of cell membrane and form a channel to facilitate the movement of ions through the membrane according to their electrochemical gradient
Term
Gated Channels
Definition
A channel through a membrane that can be opened or closed by chemical or electrical events
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