Friday, 22 February 2013

2.45 understand the role of the intercostal muscles and the diaphragm in ventilation

Breathing in
The intercostal muscles contract
The ribs move up and out
The diaphragm contracts and moves down
The trachea carries air towards the lungs; it splits into two bronchi- one leading to the left lung, and one o the right- which then split into even smaller tubes, called bronchiles; these end in alveoli where gas exchange takes place.
The pleural membranes prevent friction.

Breathing out
The intercostal muscles relax
The ribs drop down
The diaphragm also relaxes and moves upward
These things reduce the space inside the lungs, pushing the air out.
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5 comments:

  1. Unknown30 March 2014 at 08:53

    This comment has been removed by the author.

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  2. Mike Tsang26 June 2017 at 02:49

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

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

    ReplyDelete
  3. SophieRice26 June 2017 at 18:03

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/245-understand-role-of-intercostal.html

    ReplyDelete
  4. john smith30 March 2018 at 03:21

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  5. Shahid N24 December 2018 at 05:53

    This comment has been removed by the author

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