Duct in Biology
In physiology and anatomy, a duct is a tube-like structure or a channel that transmits secretion from the endocrine organs to the place of its activity or requirement.
Ducts travel from the acinus sites that generate secretions. Ducts form a system that can be of three types:
Intercalated duct: It is a part of the exocrine gland that leads directly from acinus to a striated duct. This intercalated duct forms a part of the interlobular duct. This duct has thinnest epithelium and is of simple cuboidal type.
Striated duct: It is a gland that connects an intercalated duct to an interlobular duct. It has basal infoldings of the plasma membrane, characteristic of ion-pumping activity by the numerous mitochondria. This intercalated duct forms a part of the interlobular duct. This type of duct has simple cuboidal or simple columnar.
Intralobular duct: It is present inside the exocrine gland leading directly from acinus to an interlobular duct. It is composed of two subdivisions, the striated duct and the intercalated duct.
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