1.3 like a pair of bellows

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Ways of breathing

Thoracic inhalation:

1. intercostal muscles contract
2. ribs move up
3. ribs pull the pleural membrane open
4. pleural membrane pulls open the lungs
5. air is sucked into the lungs

Thoracic exhalation:

1. intercostal muscles relax
2. ribs move down
3. ribs push the pleural membrane closed
4. pleural membrane pushes closed the lungs
5. air is pushed out of the lungs

Abdominal inhalation:

1. abdominal muscles contract
2. the diaphragm moves down
3. the diaphragm pulls the pleural membrane open
4. pleural membrane pulls open the lungs
5. air is sucked into the lungs

Abdominal exhalation:

1. abdominal muscles relax
2. the diaphragm moves up
3. the diaphragm pushes the pleural membrane closed
4. pleural membrane pushes closed the lungs
5. air is pushed out of the lungs

THORACIC INHALATION

THORACIC EXHALATION

ABDOMINAL INHALATION

ABDOMINAL EXHALATION

intercostal muscles contract

intercostal muscles relax

diaphragm relaxes

diaphragm contracts

ribs push the pleural membrane closed

the diaphragm moves up

the diaphragm pulls the pleural membrane open

Which muscles do we need for
inhalation and exhalation?

This way of breathing is:... ?

Diaphragmatic breathing is used during / in...

1. your sleep and while resting
2. action
3. both
4. neither

Recap: diaphragmatic breathing

This way of breathing is:...

Chest breathing is used during / in

1. your sleep and while resting
2. action
3. both
4. neither

Combined breathing

spirometer

measures long volume, but which one?

tidal volume: volume of air you breathe in or out

vital capacity: when you exhale as much as you can

residual volume: what's left after you exhale as much as you can

lung volume: vital + residual volume

Let's do excercise 25 page 20

homework

next lesson: study 1.3 do excercises 20,21,22,23,24