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Triple response



(immunology) The three cardinal circulatory responses of the skin (i.e. reddening, flare formation or flushing of adjacent skin, and wheal formation or swelling) to any form of injury, such as pricks, scratches, burns, exposure to corrosive chemical agents, and so on.

(botany) The three characteristic morphologic changes on an etiolated seedling in response to the presence of ethylene. These morphologic changes include inhibited root elongation, enhanced radial swelling and shortening of hypocotyl, and exaggerated curved apical hook.


In immunology, the three typical reactions of the skin to injury includes: (1) formation of erythema or red spots caused by capillary dilation from endogenous histamine like molecules released at the site of injury, (2) flare formation or expanding of reddening on adjacent skin caused by neighboring arteriolar dilatation, and (3) formation of wheals caused by increased vascular permeability and fluid accumulating at the site of injury.

In botany, the triple response is used in a bioassay to determine the presence of ethylene.


  • Lewis Triple Response (immunology)

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Algae-opinions on safety of drinking in freshwater troughs?

... I say they're awfully lucky to have you......very much appreciate your response. Makes sense to me.....I've followed the same routine for 3 years ... where we live in Northern California; lately our highs have been in the triple digits - today 110. My four horses are all - well - healthy as :lol: ...

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by Horsewoman
Sun Jul 24, 2005 1:12 am
Forum: Botany Discussion
Topic: Algae-opinions on safety of drinking in freshwater troughs?
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