Ch22 Urinary System

Ch22 Urinary System - 1 The Urinary The Urinary System...

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Unformatted text preview: 1 The Urinary The Urinary System System Excretory Systems Excretory Systems s Urinary system f elimination of water, nitrogenous waste products & salts s Respiratory system f elimination of CO 2 & water s Integumentary system f elimination of water, salts, and nitrogenous wastes (minute amounts via perspiration) s Digestive system f elimination of water, some salts, bile & digestive residue Organs of the Urinary System Organs of the Urinary System Functions of the Kidney Functions of the Kidney s Excretion of metabolic waste: s urea & nitrogenous wastes, excess salts, toxins s Maintenance of water balance s Regulation of acid-base balance s Regulation of blood pressure s Regulation of RBC production Anatomy of the Kidney Anatomy of the Kidney Anatomy of the Kidney Anatomy of the Kidney 2 Anatomy of the Kidney Anatomy of the Kidney Anatomy of the Kidney Anatomy of the Kidney s Renal cortex : outer portion; extends into the medulla through renal columns s Renal medulla : inner portion , contains: s Renal pyramids : cone-shaped masses of nephrons & collecting ducts s Papilla : pointed end of renal pyramid (points towards the renal pelvis) Anatomy of the Kidney Anatomy of the Kidney s Renal Pelvis : funnel-shaped expansion at the upper end of the ureter; extends into 2-3 major calyces f extend into minor calyces s Each minor calyx surrounds a papilla & receives urine from it The Nephron: the Functional Unit of The Nephron: the Functional Unit of the Kidney the Kidney The Nephron The Nephron s Functional unit of the kidney s A tiny coiled tube, the renal tubule , with a bulb at one end, the Glomerular/Bowmans capsule , which surrounds a tuft of capillaries, the glomerulus s A glomerulus and its surrounding Bowman's capsule constitute a renal corpuscle The Glomerulus The Glomerulus s The main filter of the nephron s Afferent arteriole: supplies blood to the glomerulus s Efferent arteriole: carries blood from the glomerulus s The glomerulus is the only place in the body where capillaries drain into arterioles 3 Glomerular Capillary Membranes Glomerular Capillary Membranes s Endothelial fenestrations : allow anything smaller than a RBC to pass through (not considered part of the filtration system) s Basement membrane prevents filtration of larger proteins s Slits in the membrane prevent filtration of medium sized proteins (e.g. serum albumin & gamma globulin) Types of Nephrons Types of Nephrons Classified by location of their associated renal corpuscle s Cortical nephrons (85% of all nephrons) are shorter & have their renal corpuscle in the superficial renal cortex s excretory and regulatory functions s Juxtamedullary nephrons (15% of all nephrons) have their renal corpuscle closer to the renal medulla , & extend more into the medulla (i.e. longer than cortical nephrons) s concentrate & dilute urine s responsible for the development of the osmotic gradient in the renal medulla (used to concentrate urine) Types of Nephrons Types of Nephrons Peritubular Capillaries & Vasa Recta...
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This note was uploaded on 05/04/2008 for the course HP 320 taught by Professor Islam during the Spring '08 term at USC.

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Ch22 Urinary System - 1 The Urinary The Urinary System...

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