Glands can be divided into several categories, and what are the main differences between them

Glands in the human body can be divided into two categories, one is the gland whose secretion is discharged through the duct is called exocrine gland, and the other type of gland is called hormone, which is called endocrine gland.

Endocrine glands: thyroid glands, adrenal glands.

Pituitary gland, pancreatic islets, etc. The endocrine glands have no excretory ducts, and the glandular cells are arranged in a lack of polarity, and are mostly clustered into clumps or cords. The secretions secreted by the endocrine glands are called hormones.

Its secretions directly enter the blood vessels and lymph surrounding the cells, and are transported by the blood and lymph to various tissues or organs. Endocrine glands and endocrine tissues together make up the endocrine system.

Through the regulation of body fluids, it plays an important role in regulating all aspects of the body's functions. Exocrine gland: It is a gland that carries out exocrine, which is generally composed of two parts, that is, the gland surrounded by the glandular epithelium and the duct that excretes secretions, that is, the excretory duct, so it is also called the ductal gland.

Exocrine glands include salivary glands, sweat glands, and sebaceous glands.

Liver, mammary glands.

Pancreas, etc. (The pancreas is divided into endocrine and exocrine parts, most of the pancreas belong to the exocrine department, but the islets belong to the endocrine department). Exocrine glands have excretory ducts, called glandular ducts, through which their secretions are transported to the corresponding tissues or organs to play their regulatory role (generally excretory).

1. Glands refer to tissues distributed throughout the body that can secrete special substances, such as the oral cavity, respiratory tract and other glands are densely distributed. In particular, in clinical practice, it may refer to specific glands, that is, adenoids, which are mainly located in the nasopharynx behind the nose and above the throat, and usually the adenoids in infants and children are hypertrophied.

2. Some children's glandular hypertrophy can block the nasal cavity, causing runny nose, nasal blockage, etc., causing sinusitis. If hypertrophy is very noticeable, it may cause an adenoid facial, usually adenoidal atrophy at the age of 10-14 years. If it does not atrophy and causes symptoms, surgical excision is usually done.

Glands are tissues in animals and/or bodies that produce special substances, mainly hormones (formerly known as hormones), which are transported through the bloodstream to the body or exocrine glands. There are many ways to classify "glands", which can be divided according to the location and function (function) of the tissue, and the classification is not exactly the same in anatomical and physiological terms.

The glands are not in the part of the human body, the glands are a type of tissues and organs in the human body, and there are many glands in the human body, such as the thyroid gland or the breast, which are all glands. Glands have some secretory functions, including some glands that control endocrine, such as thyroid hormones secreted by the thyroid gland, which is an important endocrine hormone. There are also exocrine glands, such as the mammary glands, which can produce milk; The pancreas can secrete digestive juices such as pancreatic juice.

There are also many digestive glands in the system, and all organs that can secrete digestive juices contain some glandular tissues, such as the liver, which is the largest digestive gland in the human body, which can secrete bile. Therefore, the glands are not confined to a certain part of the human body, but exist in many parts of the human body, multiple tissues and organs.