Saturday 23 February 2013

2.69 understand how the kidney carries out its roles of excretion and osmoregulation

Excretion
amino acids contain nitrogen- which is toxic to the body- the liver converts it into urea. The kidneys filter urea from the blood stream and combine it with water to create urine which then moves into the bladder.

Osmoregulation
The kidneys react to ADH hormone released by the pituitary gland. If there is too little water ADH will be released and the kidneys will reabsorb water so that it can stay in the body. If there is too much water then less ADH is released and the kidneys reabsorb less water, so it is lost in urine.
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10 comments:

  1. Unknown14 June 2014 at 03:46

    Hey Hannah,

    Your blog is great, but with this particular point isn't it that when ADH is released more water is reabsorbed back into the bloodstream from the collecting duct?

    I may of course be wrong, but I thought I should check!

    Thanks so much for all the great help this blog has given me!

    ReplyDelete
    Replies
    1. Unknown15 June 2014 at 08:19

      Yeah that sounds right to me, I think it's reabsorption as opposed to absorption changes.

      Delete
    2. HannahHelp17 June 2015 at 15:01

      You are right I apologise for just having this completely wrong hahaha
      Thank you Sarah for your great help!!

      Delete
    3. Alex30 April 2017 at 03:44

      Is the version there right now correct?

      Delete
  2. Rekker14 March 2016 at 15:07

    update?

    ReplyDelete
  3. Rekker14 March 2016 at 15:07

    update?

    ReplyDelete
  4. Anonymous29 November 2016 at 11:28

    Is this the updated version then, Hannah?

    ReplyDelete
  5. Mike Tsang26 June 2017 at 03:04

    The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  6. SophieRice26 June 2017 at 18:22

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/269-understand-how-kidney-carries-out.html

    ReplyDelete

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