Produce lipid lipid coalesces into lipid droplet and

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Unformatted text preview: eak up and the break-up fragments filled w/ pdt IS the secretion! Produce lipid, lipid coalesces into lipid droplet and BULGES OUT of cell membrane and PINCHES OFF -- remains surrounded by a bit of the cell's membrane! Apocrine secretion of lipid droplets in epithelial cells of mammary gland: Fig. 4-23 Holocrine secretion in sebaceous gland of skin Duct This is what casuses acne!!! Inflammation -- the duct gets CLOGGED with oil! Terminally differentiated cells Mitotic cells Fig. 4-22 Exocytosis is the basis for merocrine secretion in which secretory granules, formed via the RER-Golgi apparatus continuum, fuse with the cell membrane, releasing their contents externally. Secretion is usually at the apical end and the cells are “polarized” from one end to the other. POLARIZED -- basal end is BASOPHILIC bc of a ton of ROUGH ER down there! pancreas secrete watery secretion rich in protein -typically enzymes. These glands stain well bc of all the protein they are secreting! referred to as SEROUS acini or SEROUS tubules. Fig. 4-24 Two kinds of merocrine secretion can be distinguished by H&E staining of glands: 1. Serous: well-stained secretory granules containing protein cells makes this glycoprotein called mucin -- super philic -- binds lots of water -2. Mucous: granules primarily containing mucin, a hydrophilic stain poorly...
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This document was uploaded on 02/04/2014.

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