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Synergists
Antagonism is the process by which two hormones exert opposite effects.
An additive response is one in which the antimicrobial effect of the combination of drugs is equal to the sum of the effects of the two drugs alone.
You could call them a pair of additive inverses.
growth hormone and thyroxine
Two integers that add to zero are additive inverses.
When two or more hormones work together to produce a particular result, their effects are said to be synergistic. These effects may be additive or complementary. The action of epinephrine and norepinephrine on the heart is a good example of an additive effect. Each of these hormones separately produces an increase in cardiac rate; acting together in the same concentrations, they stimulate an even greater increase in cardiac rate. The synergistic action of FSH and testosterone is an example of a complementary effect; each hormone separately stimulates a different stage of spermatogenesis during puberty, so that both hormones together are needed at that time to complete sperm development. Likewise, the ability of mammary glands to produce and secrete milk requires the synergistic action of many hormones-estrogen, cortisol, prolactin, oxytocin, and others.
Polygenic.
Growth Hormones but they have side effects.
A hyper additive drug interaction is an interaction between two drugs of the same class doing what one drug alone could have done. Hyper additive drug interactions are one reason for antibiotic resistance.
The presence of other hormones, especially auxins, influence the effects of cytokinins.
its what happens when a drug decreases the effect of another drug