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A muscle that assists a prime mover muscle in performing a specific action.
A material that enhances the effect of another material so that when they are combined the total effect is greater than the sum of their individual effects.



(1) In anatomy and physiology, a muscle (or group of muscles) that acts jointly and functions homogeneously with another muscle (or group of muscles) in the same movement.

Examples of synergists in mammals (including humans) are the external intercostal and intercartilagtnous muscles and the muscles of the diaphragm, which, by contracting simultaneously, ensure the act of inhalation. Muscles that act together in performing a particular movement may be antagonists in the execution of other movements. The phenomenon of synergism is ensured by the regulatory activity of the central nervous system.

(2) In pharmacology, one of several medicinal agents used jointly whose combined effect on the body exceeds the effect exerted by each separately. Direct synergists act on the same reactive systems of the body, such as the simultaneous influence of two adrenomimetic substances. Indirect synergists exert the same end effect but differ in their mechanisms of action. For example, adrenaline and atropine act along different pathways to produce dilatation of the pupils; when taken together, the overall effect of these substances on the pupil exceeds the effect of each separately.

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These four course examples illustrate how the anchoring theories--the NETS-A, blended instruction, situated learning theory, and technology integration--combine synergistically in the School Technology Leadership curriculum.
It has also been found that ATH reacts synergistically with zinc borate.
Like zinc borate, molybdenum compounds function synergistically with halogen flame retardants and suppress smoke as well as flame.
Although the underlying mechanism behind the survival bonus remains unknown, the researchers speculate that foscarnet may work synergistically with other antiviral drugs such as zidovudine.
Cofactors are independent organisms or molecules that act synergistically to foster or cause disease.
The data suggest the two viruses act synergistically, attacking the immune system's T-cells in an accelerated fashion.
Tengerdy's data now show that dietary fats also interact synergistically with vitamin E to bolster immunity.
In the July TOXICOLOGY AND APPLIED PHARMACOLOGY, Warren, Daniel Guth and Jerold Last report that ammonium sulfate, the most common acidic aerosol in smog, indeed interacts synergistically with ozone at concentrations of ozone common in the Los Angeles basin--0.