The Mechanism of Breathing

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Presentation transcript:

The Mechanism of Breathing L.O: to describe the steps in inspiration and expiration to define and calculate pulmonary ventilation Starter: Recall knowledge from last lesson and answer this exam q worth 5 marks:

How do we breathe? http://www.bbc.co.uk/learningzone/clips/how-do-we-breathe/10646.html

Mechanism of Breathing Inspiration Expiration External intercostal muscles Internal intercostal muscles Ribs Diaphragm Volume of thorax

Mechanism of Breathing Inspiration Expiration External intercostal muscles Contract Internal intercostal muscles Relax Ribcage Up and out Diaphragm Volume of thorax Increases

Mechanism of Breathing Inspiration Expiration External intercostal muscles Contract Relax Internal intercostal muscles Ribcage Up and out Down and in Diaphragm Volume of thorax Increases Decreases

Under Pressure http://www.bbc.co.uk/learningzone/clips/under-pressure/10861.html

Under Pressure http://www.youtube.com/watch?v=aw9PTVmPJAY

Pulmonary Ventilation Pulmonary = Tidal x Ventilation Ventilation Volume Rate Total volume of air moved into the lungs in one minute Volume of air in each breath Number of breaths in one minute dm3 min -1 dm3 min-1

Past Exam Question

Now leave your work from today on my desk please. Thank you 