Final answer:
Histamine plays a key physiological role in the body. It is released by basophils and is involved in various processes such as inflammation and immune responses. Histamine causes vasodilation, stimulates mucus secretion, and is associated with allergic reactions.
Step-by-step explanation:
Histamine plays a key physiological role in the body. It is released by basophils, which are a type of white blood cell. Histamine functions as a chemical messenger and is involved in various processes such as inflammation and immune responses.
One of the main functions of histamine is to cause vasodilation and increase the permeability of blood vessels. This helps to bring more blood flow to injured or infected areas, facilitating the immune response and healing process. Histamine also stimulates mucus secretion, tears, and itching, which are common symptoms of allergies.
In addition to its role in allergic reactions, histamine is involved in other physiological processes such as regulating smooth muscle contractions and promoting digestive function.