Alveolar gland

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  Alveolar gland
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  Simple branched acinar gland
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  Compound tubulo-acinar gland
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  Alveolar gland
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  Alveolar gland
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  Alveolar gland

Alveolar gland

An alveolar gland is a type of exocrine gland characterized by its sac-like secretory units. These glands are also known as acinar glands, and they play a crucial role in the secretion of various substances in the body. Alveolar glands can be found in several locations, including the mammary glands, sebaceous glands, and certain salivary glands.

Structure

Alveolar glands are composed of clusters of secretory cells that form small, rounded sacs called alveoli. These alveoli are connected to a duct system that transports the secreted substances to the surface of the epithelium. The secretory cells in the alveoli are typically arranged in a single layer and are responsible for producing the gland's specific secretion.

The duct system of an alveolar gland can be simple or branched. In simple alveolar glands, each alveolus is connected directly to the main duct. In compound alveolar glands, multiple alveoli are connected to a branched duct system, which eventually leads to a single main duct.

Function

The primary function of alveolar glands is to produce and secrete substances necessary for various physiological processes. For example, the alveolar glands in the mammary glands produce milk during lactation. Sebaceous glands, which are also alveolar in structure, secrete sebum, an oily substance that helps to lubricate and protect the skin.

Types of Secretion

Alveolar glands can be classified based on the type of secretion they produce:

• Serous glands: These glands secrete a watery, protein-rich fluid. An example is the parotid gland, a type of salivary gland.
• Mucous glands: These glands secrete a viscous, carbohydrate-rich fluid. The sublingual gland is an example of a mucous gland.
• Mixed glands: These glands produce both serous and mucous secretions. The submandibular gland is an example of a mixed gland.

Related pages

• Exocrine gland
• Mammary gland
• Sebaceous gland
• Salivary gland
• Duct (anatomy)