Allergies trigger the body to release histamine, a chemical that causes symptoms like sneezing and itching. This overproduction of histamine can lead to inflammation and other allergic reactions in the body.
Histamine is produced by the body in response to allergens, and antihistamine drugs work by blocking the action of histamine in the body.
When histamine is produced in the body, it can be over-produced because we are taking too much of one thing or another that our body cannot use.
histamine
histamine is a compound produced in the body which causes pain and sweeling
According to the Cleveland Clinic web site, "Antihistamines help relieve symptoms by blocking the action of histamine. Histamine is a naturally occurring substance that is released by the immune system after being exposed to an allergen. When you inhale an allergen, mast cells located in the nose and sinus membranes release histamine. Histamine then attaches to receptors on nearby blood vessels, causing them to enlarge (dilate). Histamine also binds to other receptors located in nasal tissues, causing redness, swelling, itching, and changes in the secretions. By blocking histamine receptors, antihistamines prevent symptoms" (Cleveland Clinic web site 11/10/2008). So in essence what is occurring is an antihistamine blocks the ability of the body's histamine to attach to the normal receptor to tell the body to have a runny nose, itchy eyes, swelling, etc. They do not inhibit the release of histamine, as this would affect a wide array of other vital body functions that rely on histamine to work properly (such as acid production in the stomach).
yes
http://www.pharmacorama.com/en/Sections/Acetylcholine_2_2.php#5Acetylcholine is a bronchoconstrictor.
Mast cells and basophils release histamine. When histamine is released, it causes blood vessels to dilate, which can lead to symptoms such as redness and swelling (inflammation), increased mucus production, and smooth muscle contraction, resulting in symptoms like itching and bronchoconstriction.
Mast cells are the connective tissue cells that produce histamine in response to various stimuli, such as allergens or injury. Histamine is a key mediator of inflammation and allergic responses in the body.
They have completely different functions in the body; histamine stimulates certain kinds of immune responses, and serotonin is a neuro-transmitter.
Antihistamines work by blocking the action of histamine, a chemical involved in allergic reactions. Some antihistamines can also affect serotonin levels in the body by blocking the reuptake of serotonin in the brain, leading to increased levels of serotonin. This can result in side effects such as drowsiness and changes in mood.