Osmoregulation

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CONTROL OF WATER BALANCE

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Osmoregulation

  1. 1. OSMOREGULATION CONTROL OF WATER BALANCE © 2013 Iqbal Niazi
  2. 2. Fluid compartments and exchange surfaces NB Percentages shown = % Body Mass BLOOD PLASMA (5%) TISSUE FLUID (15%) EXTERNAL ENVIRONMENT CYTOPLASM (40%) Exchange surfaces Lungs Intestines Skin Kidneys Capillary networks Plasma membranes © 2013 Iqbal Niazi
  3. 3. BODY FLUID BALANCE INPUT ......……....… AND …......…….. OUTPUT BODYCOLON LUNGS SKIN Breath Sweat UrineKIDNEYS Drinking • A mammal cannot stop breathing because it would suffocate • A mammal cannot stop sweating because it would over heat • It can reduce water loss by the kidneys • It can add water to the body by drinking © 2013 Iqbal Niazi
  4. 4. Dehydration Dehydration Blood concentration rises Hypothalamus Osmoreceptors ADH Kidney Thirst reflex Concentration of circulating blood Less urine + concentrated urine Drinking, water absorbed by the colon Blood concentration falls NEGATIVE FEEDBACK © 2013 Iqbal Niazi
  5. 5. Hyperhydration Blood concentration falls Hypothalamus Osmoreceptors Kidney More urine + diluted urine Blood concentration rises Concentration of circulating blood Note: for a terrestrial animal this is a less likely situation and it is easy to lose water Dehydration is more likely so the control system has evolved to saving or getting water NEGATIVE FEEDBACK Drinking © 2013 Iqbal Niazi
  6. 6. Hyperhydration Blood concentration falls Hypothalamus Osmoreceptors Kidney More urine + diluted urine Blood concentration rises Concentration of circulating blood Note: for a terrestrial animal this is a less likely situation and it is easy to lose water Dehydration is more likely so the control system has evolved to saving or getting water NEGATIVE FEEDBACK Drinking © 2013 Iqbal Niazi

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