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Biology Definitions - A
5 cards·by 1234
Define biotic
an ecological factor that makes up part of the non-biological environment of an organism.
Define acetylcholine
a neurotransmitter that diffuses across the synapse between adjacent neurones and passes an
impulse from one neurone to the next.
Define action potential
a change that occurs in the electrical charge across the membrane of a stimulated axon when a
nerve impulse passes.
Define actin
filamentous protein involved in contraction within cells, especially muscle cells.
Define activation energy
the minimum amount of energy required by a reacting species to undergo a specified reaction.