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Osmoregulation - PowerPoint PPT Presentation


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Osmoregulation The active regulation of osmotic pressure of body fluids so that homeostasis is maintained Excretory systems Help maintain homeostasis by regulating the concentration of body fluids. Principal waste products of animal metabolism Water Carbon dioxide Nitrogenous wastes

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Presentation Transcript
slide1
Osmoregulation
    • The active regulation of osmotic pressure of body fluids so that homeostasis is maintained
  • Excretory systems
    • Help maintain homeostasis by regulating the concentration of body fluids
slide2
Principal waste products of animal metabolism
    • Water
    • Carbon dioxide
    • Nitrogenous wastes
      • Ammonia (excreted mainly by aquatic animals)
      • Urea
      • Uric acid
slide4
Terrestrial vertebrates
    • Must conserve water
    • Endotherms have high metabolic rate
    • Produce a large volume of nitrogenous wastes
    • Conserve water through efficient kidneys and other adaptations
slide6
Vertebrate kidney
    • Functions in excretion and osmoregulation
    • Is vital in maintaining homeostasis
    • Its structure and function are adapted to the lifestyle of the animal
slide15
Urine volume is regulated by ADH
    • Released by the pituitary gland in response to an increase in osmotic concentration of the blood
    • ADH increases the permeability of the collecting ducts to water
    • As a result, more water is reabsorbed
slide17
Aldosterone andatrial natriuretic peptide work antagonistically
    • When blood pressure decreases, cells of the juxtaglomerular apparatus secrete renin, which leads to production of angiotensin II
    • Angiotensin II stimulates aldosterone release, which raises blood pressure