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.

10 comments:

  1. 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!

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

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

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    3. Is the version there right now correct?

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  2. Is this the updated version then, Hannah?

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

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

    ReplyDelete
  4. more at

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

    ReplyDelete