Water balance
Another example of homeostasis
Kangaroo Rat
              lives in hot desert
cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/39558...
Little water in environment. Does not drink water!
All water comes from breakdown of nutrients.
           cc licensed fli...
Needs to conserve water. How?
 cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
Behavioural - nocturnal (active at
night, sleeps during the day
   cc licensed flickr photo by ucumari: http://flickr.com/...
Physiological - miminum water lost from urination.
(5 times more concentrated that human urine)
           cc licensed fli...
Also need to avoid having too much water.
   Excess water leads to thinner blood.
Thinner blood leads to reduced concentration of red blood
cells (a.k.a. anemia). Not enough oxygen gets to the cells.
    ...
If blood is really dilute, the red blood cells can rupture

           cc licensed flickr photo by kingdesmond1337: http:/...
Water balance is maintained homeostatically.



               Sensor
               Control centre
               Effector
Sensors


                                                       Hypothalmus - senses
                                    ...
Controller


                                                     Pituitary gland (right next to
                         ...
Effector



                                                      Kidneys
                                                ...
What if there’s too much water?

Hypothalmus
The hypothalmus stops sending signals to
thirst centres and to pituitary.

Pi...
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Water Balance

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A quick and perhaps over-simplified description of the system that keeps the water balance in humans.

Published in: Education, Technology, Business
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  • Water Balance

    1. 1. Water balance Another example of homeostasis
    2. 2. Kangaroo Rat lives in hot desert cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
    3. 3. Little water in environment. Does not drink water! All water comes from breakdown of nutrients. cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
    4. 4. Needs to conserve water. How? cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
    5. 5. Behavioural - nocturnal (active at night, sleeps during the day cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
    6. 6. Physiological - miminum water lost from urination. (5 times more concentrated that human urine) cc licensed flickr photo by ucumari: http://flickr.com/photos/ucumari/3955842320/
    7. 7. Also need to avoid having too much water. Excess water leads to thinner blood.
    8. 8. Thinner blood leads to reduced concentration of red blood cells (a.k.a. anemia). Not enough oxygen gets to the cells. cc licensed flickr photo by kingdesmond1337: http://flickr.com/photos/kingdesmond/2872482711/
    9. 9. If blood is really dilute, the red blood cells can rupture cc licensed flickr photo by kingdesmond1337: http://flickr.com/photos/kingdesmond/2872482711/
    10. 10. Water balance is maintained homeostatically. Sensor Control centre Effector
    11. 11. Sensors Hypothalmus - senses concentration of blood. Blood vessels - sense blood volume. If concentration is too cc licensed flickr photo by EUSKALANATO: http:// flickr.com/photos/17657816@N05/1971827663/ high or blood volume is low, sends signal to the ...
    12. 12. Controller Pituitary gland (right next to hypothalmus) If blood concentration is too high, it secretes vasopressin cc licensed flickr photo by EUSKALANATO: http:// flickr.com/photos/17657816@N05/1971827663/ (a.k.a. antidiuretic hormone a.k.a. ADH), a hormone that acts on the ...
    13. 13. Effector Kidneys ADH causes the kidney to reduce urine production. Water loss through kidneys is reduced. Brain The hypothalmus activates parts cc licensed flickr photo by Kaptain Kobold: http:// flickr.com/photos/kaptainkobold/273001185/ of brain that cause thirst.
    14. 14. What if there’s too much water? Hypothalmus The hypothalmus stops sending signals to thirst centres and to pituitary. Pituitary decreases ADH secreted. Kidneys release more water into urine
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