Nephron Loop - Has a cuboidal epithelium with...

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Urinary System Nephron Loop * Descending limb- first portion of the loop, passes from the cortex into the medulla * At its deep end it turns 180 o and forms an ascending limb that returns to the cortex. * The nephron loop is divided into thick and thin segments * Thin segments - has a simple squamous epithelium * Cells have low metabolic rate but are very permeable to water * Forms the lower part of the descending limb, the bend, and partway up the ascending limb * Thick segments - have a simple cuboidal epithelium with lots of mitochondria in the cells due to the high metabolic activity of active transport. * Form initial parts of the descending limb and part or all of the ascending limb Distal Convoluted Tuble * Shorter and less coiled than the PCT, so fewer sections are seen in histological sections *
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Unformatted text preview: Has a cuboidal epithelium with smooth-surface cells nearly devoid of microvilli Collecting Duct * The DCTs of several nephrons drain into a this straight tube, which passes into the medulla * Are both lined with simple cuboidal epithelium Collecting Duct * Near the papilla, several collecting ducts merge to form a larger papillary duct * About 30 of these from each papilla into its minor calyx Cortical and Juxtamedullary Nephrons * Cortical Nephrons-nephrons close to the kidney surface * Have shorter nephron loops that dip only slightly into the outer medulla before turning back * Juxtamedullary nephron-nephrons close to the medulla * Have very long loops that extend to the apex of the renal pyramid * Responsible for maintaining the salinity gradient...
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