TCDHA Histology & Embryology Test 2 Questions with Correct Answers

TCDHA Histology & Embryology Test 2 Questions with Correct Answers Exocrine Glands - Answer-gland that secretes its products through excretory ducts to the surface of an organ or tissue or into a vessel Endocrine glands: - Answer-glands that secrete chemicals called hormones directly into the bloodstream Exocrine glands have 4 characteristics; - Answer-1. Duct system 2. Shape of secretory unit 3. Mode of Secretions 4. Nature of secretion Serous Secretions are - Answer-Clear, watery, with protein. Contains digestive enzyme Amylase Mucous Secretions are - Answer-cloudy, mucin (glycoproteins) with water Unicellular Secretory Unit - Answer-Goblet Cells Multicellular secretory unit - Answer-Tubular, alveolar/acinus Merocrine Glands - Answer-secrete product through free surface, no loss of cytoplasm/cell (salivary glands, pancreas) Apocrine Glands - Answer-Secrete small amounts of cytoplasm/cell with secretory product. Apical portion pinches off + detaches. Ex. Mammary glands Holocrine Glands - Answer-entire cells are discharged as secretion (sebaceous glands) Acinus/Acini - Answer-Consists of single layer cuboidal epithelial cells surrounding a lumen(central opening) where the saliva is deposited after being produced by secretory cells Located at terminal part of gland Intercalated duct - Answer-Duct associated with acinus or terminal part of salivary gland. Parotid Gland - Answer-Largest (Stensons Duct) Duct system consists of LONG intercalated ducts and SHORT striated ducts with basal striations. Serous secretion 25% salivary volume Mumps - Answer-viral infection of the parotid gland Submandibular Salivary Gland - Answer-Medium, capsulated gland Wharton's duct, opens under tongue near frenum at sublingual caruncle Duct system consists of SHORT intercalated ducts and LONG striated ducts with basal striations 60-65% salivary volume Mixed gland, but serous dominates Sublingual Salivary Gland - Answer-Under tongue Smallest, NO capsule Bartholins Duct Mixed, but mainly mucous 10% salivary volume Mucocele - Answer-accumulation of saliva in mucosa due to trauma to minor salivary duct Xerostomia - Answer-dry mouth Enamel - Answer-Avascular, NON vital 96% inorganic - mainly calcium hydroxyapatite 1% organic - enamelin (protein component) Amelogenesis - Answer-Process of enamel matrix formation and mineralization