What is triple response in physiology?
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The triple response of Lewis is a cutaneous response that occurs from firm stroking of the skin. This produces an initial red line, followed by a flare around that line, and then finally a wheal.
What is triple response of histamine?
Thus, histamine is known to cause the “Triple Response” of Lewis and to act via H1 and H2 receptors to produce vasodilation and increased vascular permeability; elevated levels of histamine are found in inflamed tissue; histamine is produced and stored in mast cells and there are established mechanisms for histamine …
What is triple response in CVS?
Definition. (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.
What is Cutaneous triple response?
Triple response. When the skin is stroked with pointed object -the response to injury manifest as triple response . This is called as triple response as it three component red , wheal and flare . Red reaction – the skin becomes red in about 10 seconds .
What do you mean by triple response of ethylene?
Ethylene causes what is known as the “triple response” in plants: it causes plants to have short shoots, fat shoots, and increased lateral root growth. In seedlings, ethylene also stimulates root hair production by the radicle.
What is triple response hormone?
Germinating seedlings synthesize ethylene when their growth is impeded by the soil. The ethylene promotes the so – called ‘triple response’ : an exaggeration of the transient developmental structure known as the apical hook, together with the inhibition of hypocotyl and root extension growth.
What are the three characteristics of the ethylene triple responses?
i. Ethylene causes what is known as the “triple response” in plants: it causes plants to have short shoots, fat shoots, and increased lateral root growth. In seedlings, ethylene also stimulates root hair production by the radicle.
What is ethephon used for?
Ethephon is a plant growth regulator used to promote fruit ripening, abscission, flower induction, and other responses. Ethephon is registered for use on a number of food, feed and nonfood crops, greenhouse nursery stock, and outdoor residential ornamental plants, but is used primarily on cotton.
What is triple response of ethylene?
What is the pH of ethephon?
Although ethephon degrades in somewhat acidic soils (pH 6.1), it does not hydrolyze in sterile, acidic water (pH 5). The major degradates are ethylene gas and 2-hydroxy ethyl phosphonic acid.
What is ethephon and ethylene?
Ethephon is a systemic plant growth regulator belonging to the phosphonate family. It is readily absorbed by the plant and releases ethylene which is a natural plant hormone. Ethylene influences directly several physiological processes (ripening, maturation etc.) and stimulates the production of endogenous ethylene.
What is the Lewis triple response to inflammation?
Evolution of inflammatory processes in the three points described by Lewis. The triple response of Lewis is a cutaneous response that occurs from firm stroking of the skin, which produces an initial red line, followed by a flare around that line, and then finally a wheal. The triple response of Lewis is due to the release of histamine .
What are the three aspects of the triple response?
The triple response consists of three aspects: Red spot, caused by capillary vasodilation. Flare, a redness in the surrounding area due to arteriolar dilation mediated by axon reflex. Wheal, caused by exudation of extracellular fluid from capillaries and venules.
What is the triple response to histamine?
The triple response of Lewis is a cutaneous response that occurs from firm stroking of the skin, which produces an initial red line, followed by a flare around that line, and then finally a wheal. Injected intradermally histamine elicits the triple response consisting of: Red spot: due to capillary dilatation.
What is the triple response to vasodilation?
The triple response consists of three aspects: Red spot, caused by capillary vasodilation. Flare, a redness in the surrounding area due to arteriolar dilation mediated by axon reflex. Wheal, caused by exudation of extracellular fluid from capillaries and venules. The red spot emerges within 15 seconds. Flare can take up to 45 seconds to begin.