The term "alveolus of a gland" refers to a small, sac-like structure within a glandular tissue that is responsible for producing, storing, and releasing specific substances. An alveolus is a microscopic anatomical unit, resembling a tiny cavity or hollow space, which represents the functional unit of glandular tissues.
Glands are specialized organs or tissues in the body that produce and secrete substances such as hormones, enzymes, or fluids. The alveoli of a gland are located within the glandular tissue and are surrounded by supportive connective tissue. These structures form an intricate network throughout the gland.
In the context of glandular tissue, the alveoli play a crucial role in the production, storage, and release of secretory products. They are lined by specialized cells known as secretory epithelial cells, which are responsible for synthesizing and secreting the desired substances into the alveolar lumen.
When required, the secretory epithelial cells contract or release the contents of the alveoli, propelling the secretory products into the ducts or surrounding blood vessels for delivery to their target destination. This enables the gland to perform its specific functions, such as hormone regulation, lubrication, digestion, or detoxification.
The structure and organization of alveoli can vary depending on the type of gland and its overall function. For example, in mammary glands, the alveoli are responsible for synthesizing and storing milk during lactation, while in salivary glands, they produce and secrete saliva to aid in digestion and lubrication.
