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13 terms

Cell transport and signalling

Chapter 7.3 and 7.4 Biology Miller
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diffusion
process by which molecules move from an area where they are more concentrated to an area where they are less concentrated
facilitated diffusion
the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
aquaporin
A transport protein in the plasma membrane of a plant or animal cell that specifically facilitates the diffusion of water across the membrane (osmosis).
osmosis
diffusion of water through a selectively permeable membrane
isotonic
describes a solution whose solute concentration is equal to the solute concentration inside a cell
hypertonic
describes a solution whose solute concentration is higher than the solute concentration inside a cell
hypotonic
describes a solution whose solute concentration is lower than the solute concentration inside a cell
osmotic pressure
Force produced by the pressure of water diffusing through a semipermeable membrane
homeostasis
process by which organisms maintain a relatively stable internal environment
tissue
group of similar cells that perform a particular function
organ
a collection of tissues that carry out a specialized function of the body
organ system
group of organs that work together to perform a specific function
receptor
protein that detects a signal molecule and performs an action in response