324Lecture22 excretory

324Lecture22 excretory - The Urinary System Urinary System...

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The Urinary System
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Urinary System Excretory System - Mesodermally derived - Produces 1.5 L/day (urine) - Paired Kidneys, Ureters - Unpaired Bladder, Urethra - Kidney also produces: renin, erythropoetin, and calcitriol (from Vit. D 3 )
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Kidney Encased in a thick DICT capsule; no trabeculae (unique arrangement). Kidney is located outside the body cavity (Retroperitoneal). Bean shaped with hilus (medial). Space occupied by the proximal ureter and blood vessels = renal pelvis. The ureter divides in the medulla to two major calyces - each major calyx further divides into minor calyces which collect filtrate from the kidney.
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Kidney The kidney is prominently divided into a cortex and medulla. The basic functional unit of the kidney is the nephron (1-2 million per kidney) Nephron: a) blood vascular component = glomerulus b) tubular component 1) Bowman's Capsule 2) Proximal Convoluted Tubule 3) Loop of Henle 4) Distal Convoluted Tubule 5) Collecting Duct Renal Corpuscle = glomerulus + Bowman's Capsule.
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Kidney Glomerulus - coiled capillary tuft branching
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324Lecture22 excretory - The Urinary System Urinary System...

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