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action

   Also found in: Dictionary/thesaurus, Legal, Acronyms, Idioms, Encyclopedia, Wikipedia, Hutchinson 0.12 sec.
action /ac·tion/ (ak´shun) the accomplishment of an effect, whether mechanical or chemical, or the effect so produced.
ball-valve action  the intermittent obstruction caused by a free or partially attached foreign body in a tubular or cavitary structure, as by a foreign body in a bronchus, a stone in a bile duct, or a tumor in the cardiac atrium.
Enlarge picture
Ball-valve action. Calculi obstructing the cystic duct (A), common hepatic duct (B), and common bile duct (C) .
cumulative action  action of increased intensity, as the sudden and markedly increased action of a drug after administration of several doses, due to the accumulation of the drug in the body.
reflex action  a response, often involuntary, resulting from passage of excitation potential from a receptor to a muscle or gland over a reflex arc.

ac·tion (kshn)
n.
1. The state or process of acting or doing.
2. A deed.
3. A change that occurs in the body or in a bodily organ as a result of its functioning.
4. Exertion of force or power.

action,
n the coordinated movement of a group of muscles, relative to the resting position of the body.

action
1. the accomplishment of an effect, whether mechanical or chemical, or the effect so produced.
2. the gait or type of movement of an animal.

cumulative action
the sudden and markedly increased action of a drug after administration of several doses.
action lists
are produced by a computerized herd health program from the analysis of reproduction data, which set out which cows are to be examined for a variety of reproductive reasons, such as pregnancy, failure to conceive and postnatal clearance for resumption of breeding.


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