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actin - actin The protein from which microfilaments are...

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actin The protein from which microfilaments are composed; forms the contractile filaments of sarcomeres in muscle cells. action potential A reversal of the electrical potential in the plasma membrane of a neuron that occurs when a nerve cell is stimulated; caused by rapid changes in membrane permeability to sodium and potassium. active transport Transport of molecules against a concentration gradient (from regions of low concentration to regions of high concentration) with the aid of proteins in the cell membrane and energy from ATP . PICTURE adaptation Tendency of an organism to suit its environment; one of the major points of Charles Darwin's theory of evolution by natural selection : organisms adapt to their environment. Those organisms best adapted will have a greater chance of surviving and passing their genes on to the next generation. adaptive radiation The development of a variety of species from a single ancestral form; occurs when a new habitat becomes available to a population
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