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URINARY SYSTEM

URINARY SYSTEM. STRUCTURE. SEE FIGURE 20-1 PG 427. KIDNEY (FIGURE 20-2). Bean-shaped Located between peritoneum and the back muscles (retroperitoneal) Renal pelvis – funnel-shaped structure at the beginning of the ureter Medulla Inner , striated layer

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URINARY SYSTEM

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  1. URINARY SYSTEM STRUCTURE

  2. SEE FIGURE 20-1 PG 427

  3. KIDNEY (FIGURE 20-2) • Bean-shaped • Located between peritoneum and the back muscles (retroperitoneal) • Renal pelvis – funnel-shaped structure at the beginning of the ureter • Medulla • Inner, striated layer • Striated cones are renal pyramids • Base of pyramids empty into cuplike cavities called calyces • Cortex – composed of millions of microscopic nephrons

  4. NEPHRON (FIGURE 20-3) • Functional unit of kidney • Bowman’s capsule • Glomerulus • Proximal convoluted tubule • Loop of Henle • Distal convoluted tubule • Collecting tubule • See Figure 20-4 pg. 431 for “Pathway of urine formation” • Figure 20-5 pg. 432

  5. URETERS • One from each kidney • Smooth muscle tube with mucous membrane lining

  6. URINARY BLADDER • Hollow, muscular organ • Made of elastic fibers and involuntary muscle • Stores urine – about 500 cc

  7. URETHRA • Connects bladder with urinary meatus • Urinary meatus is opening to body

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