Group of epithelial cells specialized for the function of secretion. D. Pancreas is both exocrine and endocrine. All glands result from ingrowth of an epithelial layer into underlying connective tissue. Because endocrine glands are ductless, each cell must lie close to a capillary.
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Chemical Classification of Hormones. Chain of amino acids. Derivative of the amino acid, tyrosine. Short duration of action. Synthesized from cholesterol.