Histamine
* Some histamine causes allergic reaction.
* affects nearby nerves resulting in itching.
* aids the thalamus in sensory integration.
* also causes dilation of blood vessels, increasing blood flow into the area
  - intense itching
  - itchiness by acting on sensory nerve terminals
  - vasodilation which results in increased blood flow to the area
  - dilates small blood vessels and increases their permeability
  - opens up blood vessels
  - stimulates the secretion of the digestive enzyme gastrin
* are another culprit in red wines that can cause headaches
  - the chemicals responsible for eye irritation and itching
* can also cause some persons to have hives, with severe itching of the skin
  - close bronchial tubes and make breathing difficult
  - be present in the nose, sinuses, ears, and throat
* can cause inflammation directly as well as indirectly
  - itching, sneezing, runny nose, and watery eyes
  - swelling in the intestines, joints, lungs, sinus and skin
  - reduce or eliminate the effects of the antihistamines that cause allergy symp- toms
* cause inflammation in the nose, eyes, lungs, skin and digestive system, etc
  - vasodialation and increased vascular permeability
* causes a child to react by wheezing, sneezing, having runny eyes or itching
  - allergy symptoms
  - blood vessels to dilate, leaking fluid
  - hives, itching, and flushing
  - many allergic symptoms
  - pain inflammation
  - small blood vessels to widen
* causes the nose lining to swell, itch, and produce excess mucus
  - skin to break out in hives
  - tissues to itch, swell, and produce more mucus or tears than is normal
  - tiny blood vessels to leak fluid, the fluid gathers in the skin and causes a rash
* cell mediator usually involved in the inflammatory response.
* chemical in some cells of the body that causes production of acid in the stomach
  - present in the gastric mucosa
  - produced in the body from the essential amino acid histidine
* dilates blood vessels and makes the vessel walls abnormally permeable.
* directs some neurotransmitters to operate sub-systems to regulate water intake.
* has many actions in both the periphery and in the central nervous system.
* helps regulate blood pressure and gastric secretion.
* increases capillary permeability to small solutes.
* induces a series of allergic reactions in humans.
* is a.
* is also a powerful stimulant of the sneeze reflex
  - responsible for sneezing, itching and irritation in the nasal and throat passages
* is an amplifying substance in acid secretion
  - important protein involved in many allergic reactions
  - inflammatory substance released during allergic response
  - associated with increased nasal and sinus congestion
  - chemical compounds
  - chemically similar to serotonin, epinephrine, and norepine-phrine
* is extracted from a sample in a quick water extraction process
  - using a quick water extraction process
  - heat-stable and survives thermal processing
  - involved in allergy and inflammatory response
  - located in neurons within the caudal hypothalamus
  - made predominantly by the mast cell
* is one of the biogene amines
  - body's triggers for promoting inflammation
  - primary mediators of gastric acid secretion
  - principal chemicals involved in the allergic response
  - paraffin
  - present in all body tissues and produced by the mast cells found in connective tissue
  - primarily responsible for watery, itchy eyes and many other typical allergic symptoms
  - primary preformed vasoactive mediator in basophils and mast cells
* is released by body tissues during an allergic reaction
  - certain cells during an allergic reaction
  - during allergic reaction, and caused itching and watery eyes
* is released from cells called mast cells by either an allergic or non-allergic reaction
  - certain white blood cells when they break down
* is released in high quantities after injury or trauma
  - response to injury by foreign substances such as pollens
  - that produces the typical allergy symptoms
  - when a person's immune system tries to fight a foreign substance
  - responsible for flulike symptoms
* is responsible for many allergic symptoms
  - allergy symptoms such as sneezing and nasal congestion
  - the itching, swelling and increased mucus secretion
  - stored in granules within mast cells together with other vasoactive chemicals
  - synthesized by the decarboxylation of the amino acid histidine
* is the main substance responsible for the symptoms characteristic of an allergic reaction
  - most potent stimulus for HCl secretion
  - product of the decomposition of a chemical compound found in most fish
  - substance that causes such symptoms as watery eyes and itchy nose
  - to be used only under the supervision of a doctor
* is what causes the allergic symptoms
  - sneezing, runny nose, and watery eyes associated with most allergies
* is, however, only one of many mediators that can induce pruritus of the skin.
* mediates many allergic responses.
* mediator in the gastrin stimulated release of gastric acid.
* narrows air passages in the lungs and contributes to inflammation.
* natural blood vessel dilator while antihistamine tends to constrict blood vessels.
* neurotransmitter that is regulated during delta sleep.
* normal chemical of the body.
* potent inhibitor of neutrophil microbicidal activity
  - stimulant of acid secretion in the stomach
* powerful chemical that causes the cells to swell and itch.
* produces hives, watery eyes, sneezing, and itching.
* protects T cells and natural killer cells against oxidative stress.
* serves as a neurotransmitter and neuromodulator in the brain.
* substance that is found in the body, and acts as a mediator, affecting many systems.
* suppresses non-NMDA excitatory synaptic currents in rat supraoptic nucleus neurons.
* tend to dilate blood vessels.
* when liberated into the blood skin can cause redness, swelling and itching.