What is the difference between endocrine and exocrine glands? What are hormones? What are the different classes of hormones, examples of each and their basic functions?
A gland is defined as an organ that secretes a chemical substance. It is made up of a group of cells. It is formed by an ingrowing epithelium. Initially, it comprises a column of cells which branches off to form compound glands. The classification of a gland is based on its shape. A tubular gland has a tubular shape. If the secretory part of the gland has a bulb-like shape due to swelling then it is called the alveolar gland. The glands which curl are called coiled glands and the glands which have a lobed berry look is called an acinar gland. The glands which contain either no branches or a minimal number of branches are called simple glands. The different types of simple glands include the simple tubular glands, the simple branched tubular glands, simple coiled tubular glands, simple acinar glands, and the simple branched acinar glands. Compound glands are highly branched and more complicated when compared to simple glands. There are three types of compound glands namely the compound tubular, compound acinar, and compound tubule acinar glands.
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