BIOL 20300 Lecture Notes - Lecture 2: Urinary Bladder, Nephron, Microvillus
6 Sep 2016
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Epithelial tissues: sheets of cells that cover the outside of your body, endocrine glands and exocrine glands develop from epithelial tissue, characteristics: Structurally polarized- free apical surface, basal surface has connective tissue underneath. Non-vascular- doesn"t have its own blood supply. Tightly packed together- form very solid sheets of cells. Attached by cell junctions (ex. tight junctions: types of epithelial tissues. Simple squamous: delicate cells located in alveoli of lungs, lines blood vessels, covers serous membranes. Simple cuboidal: involved in secretion and absorption. Located: lines ducts of exocrine glans and kidney tubules. May have microvilli and goblet cells (secretes mucus) Cilia- constantly moves to trap unwanted materials to dispose of naturally. Located in the throat, vagina, anal canal. Outer layer is dead so it can shed. Endocrine glands: secrete into the blood stream (ex. hormones, thyroid, pancreas pituitary) Exocrine gland- secretes out (ex. sweat, saliva, digestive juices)
