In humans emit cancer internal, external and mixed gland secretion.By the exocrine glands can be attributed, for example, salivary glands, which produce their own secret (in this case - the saliva), which is output through special ducts.As for endocrine (internal secretion), they produce specific substances - hormones - which are released directly into the blood.
mixed gland - these formations, which secrete both hormones and other substances (enzymes, digestive juices, etc.).These include pancreas and sex glands, as well as kidney, cancer of the stomach and duodenum.
Pancreas - it's a big mixed gland, which is located behind the stomach.It consists of a head, tail and body.
As you know, this organ is part of the digestive system.Gland ducts open into the duodenum, which is released and the so-called pancreatic juice.Enzymes contained in the juice are responsible for the breakdown of fats, carbohydrates and proteins.
example, pancreatic amylase is responsible for the cleavage of dextrin and other carbohydrates.Fats fall into monomeric units under the influence of lipase.In addition, the pancreas secretes trypsinogen and chymotrypsinogen - enzymes for the digestion of protein compounds.These substances are activated in the gut lumen.
Secret pancreas also contains bicarbonate ions.Their main function - is the neutralization of acidic chyme, which moves into the intestine from the stomach.
As for the internal secretion, this function is carried out by specific parts of cancer - the islets of Langerhans.There are several types of cells:
- beta - cells - are responsible for the synthesis of insulin;
- Alpha - cell - synthesized hormone glucagon;
- Delta - cells - are responsible for the production of somatostatin;
Insulin and glucagon - are hormones which are responsible for the metabolism of carbohydrates, particularly glucose.Influenced insulin increases the intensity of the formation of glycogen, which is then stored in the liver.Glucagon, in turn, acts as an antagonist - it stimulates glycogen breakdown and protein.As for somatostatin, the substance capable of delaying the activity of both glucagon and insulin.
Female genital gland - it is also a mixed gland secretion.These include the ovaries, which passes and growth, maturation and release of eggs.But the function of the ovaries are not only in procreation.
basic female hormones - it estrogens (synthesized in the follicle) and progesterone (corpus luteum produced).Estrogen - is a group of substances under the influence of which the development of female sexual characteristics, as well as growth and breast enlargement, the growth of the uterus, vagina, fallopian tubes and ovaries.Thanks to them, body hair is carried out by female type.In addition, it stimulates the formation of estrogen and fat distribution throughout the body.
Progesterone is produced by the corpus luteum after the release of an egg from the follicle.Its main function - preparing the uterus for implantation of the embryo, as well as control over the normal course of pregnancy.While carrying a child under the influence of progesterone slows down the process of ovulation.
male gonads - is a mixed gland secretion, which are responsible for the production of sex cells and hormones.In the formation of the testes, growth, development and maturation of sperm.
male sex hormones - androgens is, of which the most famous is the testosterone.Under the influence of this substance is carried out the development of primary and secondary sexual characteristics - the growth of external and internal genital organs, deep voice, Bole developed musculature, body hair, etc.
As you can see, a mixed gland secretion are of great importance in the human body and the maintenance of homeostasis.
