Friday, 22 February 2013

2.64 explain how the heart rate changes during exercise and under the influence of adrenaline

During exercise muscles require more energy which is created by respiration, that requires more oxygen to be brought to cells and more carbon dioxide to be taken away, this means the heart needs to increase its speed so that more blood is sent to muscles.
Adrenalin- produced in the adrenal glands in top of the kidneys- stimulates adrenegic receptors in the heart which increase the rate that your heart cells work at.

This is a good source:
http://www.livestrong.com/article/355672-why-adrenaline-speeds-up-heart-rate/
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7 comments:

  1. Unknown22 November 2014 at 05:28

    *adrenalinE

    ReplyDelete
  2. Unknown10 May 2015 at 03:52

    Energy can't be created or destroyed. It is *released through respiration.

    ReplyDelete
    Replies
    1. Unknown18 April 2017 at 13:50

      glucose + oxygen = carbon dioxide + water + (some energy)
      AEROBIC RESPIRATION

      Aerobic respiration - the release of energy from food...

      Delete
  3. Unknown12 June 2016 at 08:30

    *adrenergic

    ReplyDelete
  4. Unknown18 April 2017 at 13:53

    Adrenaline speeds up your heart rate, increases your energy supplies and raises your blood pressure.

    Welcome to the grind..

    ReplyDelete
  5. Mike Tsang26 June 2017 at 03:02

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

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

    ReplyDelete
  6. SophieRice26 June 2017 at 18:18

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/264-describe-how-heart-rate-changes.html

    ReplyDelete

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