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Urinary System

Urinary System

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Urinary System

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  1. Urinary System

  2. Urinary System Functions • Remove salts and nitrogenous waste • Maintain water and electrolyte concentration • Regulate pH and volume of fluids • Help control RBC production by secreting erythropoieten • Made of • Kidneys-filtering units • Ureters-transport urine from kidney to bladder • Bladder-holds urine • Urethra-gets it out of the body

  3. Label your diagram.

  4. Kidney Function • Remove metabolic waste from blood, dilute it with water and electrolytes to form urine • Secrete erythropoeiten-control RBC production • Activation of vitamin D • Maintain blood volume and pressure • Retroperitoneally located-behind parietal peritoneum; left slightly higher than right

  5. Kidney Structure • Renal sinus-hollow chamber in the kidney • Renal pelvis-funnel shaped sac • Divided into major and minor calyces • Small renal papillae project into minor calyces • 2 major portions of the kidney • Medulla-houses tubes leading to papillae • Cortex-has functional unit of kidneys called nephrons

  6. Label the diagram on your sheet.

  7. Renal blood flow • Renal arteries branch off the abdominal aorta • These branch into smaller arterioles • Afferent arteriole-leads to the nephron • Renal vein leaves the kidney and attaches to the inferior vena cava

  8. Nephron-1 million nephrons per kidney • 2 parts • Renal corpuscle-filtering portion of the kidney • Glomerulus-ball of capillaries • Blood is filtered here • Capillaries have tiny openings called fenestrae to increase permeability • Glomerulus capsule (Bowman’s capsule) -surrounds the glomerulus • Receives the fluid the glomerulus filters • Renal tubule-tube that leaves the glomerulus capsule

  9. Label the diagram.

  10. Nephron blood supply • Afferent arterioles-lead into the capillaries of the glomerulus • Efferent arterioles (smaller)-blood flows into these after filtration in the glomerulus • Peritubular capillaries-efferent arterioles branch into these • Surround the renal tubule • Reabsorption and secretion here • Blood enters the venous system

  11. Juxtaglomerular Apparatus • Cells that come in contact with the glomerulus • 3 parts • Juxtaglomerular cells-smooth muscle cells • Contain renin (discuss later) • Tubule • Macula densa-densely packed epithelial cells • Come in contract with afferent and efferent arterioles • Help to determine blood pressure • Caused by stretch of cells in this area • http://www.wisc-online.com/objects/AP2204/AP2204.swf