Saturday 23 February 2013

2.89 describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation

Sweating- when too hot, glands under the skin secrete sweat, this increases heat loss by evaporation.
Vasoconstriction- blood vessels by the skin shrink, this reduces the blood which runs by the surface meaning less heat can be lost to the air.
Vasodilation- blood vessels by the skin grow, this means that more blood, and so more heat, is travelling near the surface of your body, in this way heat will be lost as it is conducted by the air.
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10 comments:

  1. Unknown28 April 2013 at 09:49

    I have found this blog really helpful, thank you! I was also wondering if you have done your GCSEs yet, and if so what did you get? Or are you taking them this summer?

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    Replies
    1. Unknown27 May 2013 at 21:34

      I've also found this blog really helpful!! taking my bio exam this june

      Delete
    2. ieatshoesforbreakfast6910 June 2018 at 14:06

      that's great to hear Mariel!

      Delete
  2. Unknown16 March 2014 at 02:53

    Vasodilation => when the blood vessels supplyong your skin capillaries dilate, blood flows into the capillaries, you flush and lose heat by radiation through your skin.

    Vasoconstriction=> if the blood vessels constrict, the warm blood is kept deep in your body so that less heat is lost.

    Very helpful!

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  3. Unknown5 April 2016 at 07:55

    Sweating cools you down as when the sweat evaporates the energy causing it to do so is provided by the body this is called the latent heat of vaporisation

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  4. ruihong0.03 May 2016 at 06:34

    Did you miss out 3.90?

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    Replies
    1. Anonymous3 April 2017 at 00:51

      Did you mean 2.90 if so here: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.

      Delete
  5. Mike Tsang26 June 2017 at 03:21

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

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

    ReplyDelete
  6. SophieRice26 June 2017 at 18:36

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/289-describe-role-of-skin-in.html

    ReplyDelete
  7. Unknown3 January 2019 at 08:21

    your so kind!!!!! if you haven't noticed this has helped loads of people (including me)

    ReplyDelete

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