Each day, about 9 liters of fluid enters the duodenum. Most chemical digestion takes place in the duodenum by chemicals secreted by the liver, pancreas and small intestine. The other two sections of the small intestine, the jejunum and the ileum, absorb food molecules by way of the villi directly into the blood stream.
Histamine is synthesised in the brain in the hypothalamus, in a specific area known as the tuberomamillary nucleus (TMN), where it acts as a signalling messenger (or neurotransmitter). The hypothalamus is the area of the brain that overseas the metabolic processes of the body found in the central nervous system.
High Histamine Symptoms. Allergic reactions are caused by high levels of histamine in the body due to reactions to allergens. Photo Credit goldenrod, sinus problems image by feisty from Fotolia.com. Histamine is a chemical compound present in the body that is formed and stored in cells called mast cells and basophiles. Histamine plays an important role in the immune system and is part of the body's protective mechanisms against foreign bodies or germs.