Friday, 3 January 2014

2.90 understand the sources, roles and effects of the following hormones: ADH, adrenaline, insulin, testosterone, progesterone and oestrogen.

ADH
Lack of water is detected by the hypothalamus in the brain, it causes the pituitary gland to produce Anti-diuretic hormone, or ADH. This makes the kidneys to reabsorb more water- so less is lost from the body.

Adrenaline
Produced in the adrenal glands in stressful situations. Heart rate quickens to increase the flow of blood to muscles- this means that they can respire more (as there is more oxygen available) to provide energy if you need to 'fight or flee'.

Insulin
Produced in the pancreas when there is too much glucose in the blood. It stimulates cells to convert the glucose into glycogen which is a from that can be stored. This means that you always have the right amount of glucose in your blood.

Testosterone
Produced in ovaries in girls and testicles in boys. Plays a key role in puberty, developing sex organs and inspiring hair growth.

Progesterone
Produced in the ovaries it maintains the lining ready for pregnancy, and continues to do so if the egg is fertilised.

Oestrogen
Produced in the ovaries, it is controls other hormones to regulate the menstrual cycle. It stops the production of FSH and starts the production of LH.
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10 comments:

  1. Unknown30 March 2015 at 05:59

    'This makes the kidneys reabsorb more water'
    aka
    'Acts on the wall of the collecting duct in the nephron to make it more permeable to water'

    ReplyDelete
  2. Anonymous13 October 2015 at 00:10

    This comment has been removed by a blog administrator.

    ReplyDelete
  3. Unknown20 October 2015 at 19:16

    All the translations of ADH, adrenaline, insulin, testosterone, progesterone and oestrogen are identified wonderful. One more:
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  4. Unknown18 January 2016 at 13:41

    This comment has been removed by the author.

    ReplyDelete
  5. Unknown18 January 2016 at 13:44

    Testosterone is only produced in boys girls have oestrogen which brings about their secondary sexual characteristics

    ReplyDelete
    Replies
    1. Anonymous19 February 2016 at 23:02

      Testosterone isn't only produced in males, it's just they produce more of it than females do

      Delete
    2. Unknown20 February 2016 at 07:58

      no testosterone is only produced in males. oestrogen is produced less in males than females

      Delete
    3. Unknown30 May 2016 at 06:14

      Unknown is right

      Delete
    4. anon3 January 2017 at 06:30

      In females: Small amount of testosterone produced in ovaries.
      In Males: Small amount of oestrogen made in testis, brain and also gained from eating alot of poultery.

      Delete
  6. SophieRice27 June 2017 at 06:28

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/290-understand-sources-roles-and.html

    ReplyDelete

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