glands
a glands is a secretary organ which may exist is a separate organ [ liver ] pancreas or may be simply a layer of cell . there is special function is to select certain substance from blood and elaborate them into important juices or secretions
type
[ exocrine] theses glands secrete [produce] their product on the surface either directly or through a duct
[endocrine] these glands release their secretion directly into blood
according to nature of secretary product glands may be...
[ eccorin or merocrine]
[apocrine]
[cytogenic]
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