Saturday 23 February 2013

2.68 recall that the lungs, kidneys and skin are organs of excretion

Lungs
Carbon dioxide- a waster product from respiring cells- is diffused into the lungs and then breathed out.

Kidneys
Excess water, urea (amino acids) and salts are diffused into the kidneys.

Skin
Water and salts are excreted through the skin.

7 comments:

  1. I think you missed out 2.67

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
    2. Pretty sure you missed 2.67.(understand the origin of carbon dioxide and oxygen as waste products of metabolism and their loss from the stomata of a leaf)

      Delete
    3. 2.67: http://hannahhelpbiology.blogspot.hk/2013/02/267-understand-origin-of-carbon-dioxide.html

      Delete
    4. bio exam tmrw all of you go do one.

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

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

    ReplyDelete
  3. more at

    http://igcse-biology-notes.blogspot.hk/2017/06/268-recall-that-lungs-kidneys-and-skin.html

    ReplyDelete