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Ch 15 Excretory Sys Overview
 

Ch 15 Excretory Sys Overview

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    Ch 15 Excretory Sys Overview Ch 15 Excretory Sys Overview Presentation Transcript

    • Chapter 15 The Urinary System
      • Functions of the Urinary System
      • 1. Elimination of waste
        • Nitrogenous wastes
        • Toxins
        • Drugs
      • 2. Regulates homeostasis
        • Water balance
        • Electrolytes
        • Acid-base balance in the blood
        • Blood pressure
        • RBC production
        • Activation of vit. D
      • Organs of the Urinary system
      • Kidneys
      • Ureters
      • Urinary bladder
      • Urethra
      • Location of the Kidneys
      • Against dorsal wall
      • Right lower than left
      • Attached to ureters, renal blood vessels, & nerves at renal hilus
      • Atop kidney is adrenal gland
      • Regions of the Kidney
      • Renal cortex – outer region
      • Renal medulla – inside the cortex
      • Renal pelvis – inner collecting tube
    •  
      • Nephrons
      • Structural and functional units of the kidneys
      • Forms urine
      • Main structures
      • a. Glomerulus
      • b. Renal tubule
      • Glomerulus
      • Glomerulus sits within a glomerular capsule (1 st part of the renal tubule)
      • Specialized capillary bed
      • Arterioles on both sides (maintains high pressure)
        • Large afferent arteriole
        • Narrow efferent arteriole
      • Renal Tubule
      • Glomerular (Bowman’s) capsule
      • Proximal convoluted tubule
      • Loop of Henle
      • Distal convoluted tubule
      • Urine Formation
      • Filtration
      • Reabsorption
      • Secretion
      • Filtration
      • Nonselective passive process
      • Water and solutes smaller than proteins are forced through capillary walls (Filtrate same as blood plasma)
      • Blood cells cannot pass out to the capillaries
      • Filtrate - collected in glomerular capsule and leaves via the renal tubule
      • Reabsorption
      • Peritubular capillaries reabsorb
        • - Some water, Glucose, Amino acids, Ions
      • Some passive, most active
      • Most reabsorption occurs in proximal tubule
      • Nitrogenous waste products
        • - Urea
        • - Uric acid
        • - Creatinine
      • Excess water
      Not Reabsorbed
      • Secretion
      • Materials left in renal tubule move to ureter
    •