action

action /ac·tion/ (ak´shun) the accomplishment of an effect, whether mechanical or chemical, or the effect so produced.

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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.

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.

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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.

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action,

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

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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.

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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.