Tissues are made of groups of cells that work together to carry out a particular function. Epithelial tissue can cover the parts of the body and glandular epithelial tissue is what makes up our glands.
Glandular epithelial tissue forms the exocrine glands (glands containing ducts) and endocrine glands (ductless glands that secrete hormones directly into the bloodstream). This tissue is called secretory tissue because glands produce useful substances called secretions that must be released from the gland to be transported to where they are needed.
Glandular secretions are produced by obtaining substances from the circulating blood and through chemical reactions, and the end-product is formed. Usually these secretions contain both water and proteins. Secretions can be digestive enzymes, hormones which are chemical messengers, and mucous, among other things.
Examples of endocrine glands include the pituitary, adrenals and the thyroid glands. Examples of exocrine glands include sweat and oil glands, mammary glands as well as digestive glands like the salivary glands.
Glandular epithelial tissue contains cells capable of secreting important substances produced by the gland.
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