Briefly describe goands
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Glands
A gland is a group of cells in an animal's body that synthesizes substances (such as hormones) for release into the bloodstream(endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).
Every gland is formed by an ingrowth from an epithelial surface. This ingrowth may in the beginning possess a tubular structure, but in other instances glands may start as a solid column of cells which subsequently becomes tubulated.
As growth proceeds, the column of cells may divide or give off offshoots, in which case a compound gland is formed. In many glands, the number of branches is limited, in others (salivary, pancreas) a very large structure is finally formed by repeated growth and sub-division. As a rule, the branches do not unite with one another, but in one instance, the liver, this does occur when a reticulated compound gland is produced. In compound glands the more typical or secretory epithelium is found forming the terminal portion of each branch, and the uniting portions form ducts and are lined with a less modified type of epithelial cell
Glands are classified according to their shape.
If the gland retains its shape as a tube throughout it is termed a tubular gland.
In the second main variety of gland the secretory portion is enlarged and the lumenvariously increased in size. These are termed alveolar or saccular glands
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Here is the answer for your question
Glands
A gland is a group of cells in an animal's body that synthesizes substances (such as hormones) for release into the bloodstream(endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).
Every gland is formed by an ingrowth from an epithelial surface. This ingrowth may in the beginning possess a tubular structure, but in other instances glands may start as a solid column of cells which subsequently becomes tubulated.
As growth proceeds, the column of cells may divide or give off offshoots, in which case a compound gland is formed. In many glands, the number of branches is limited, in others (salivary, pancreas) a very large structure is finally formed by repeated growth and sub-division. As a rule, the branches do not unite with one another, but in one instance, the liver, this does occur when a reticulated compound gland is produced. In compound glands the more typical or secretory epithelium is found forming the terminal portion of each branch, and the uniting portions form ducts and are lined with a less modified type of epithelial cell
Glands are classified according to their shape.
If the gland retains its shape as a tube throughout it is termed a tubular gland.
In the second main variety of gland the secretory portion is enlarged and the lumenvariously increased in size. These are termed alveolar or saccular glands
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