Breathing.

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Presentation transcript:

Breathing

Breathing/Ventilation Moving air into and out of the lungs Thoracic cavity is like a sealed container The diaphragm can change the volume, which in turn affects the air pressure

Inspiration As you breathe in: The inspired air expands your Diaphragm contracts (moves down) Intercostal muscles contract (expands rib cage) Abdominal muscles relax (allows compression of the abdomen) The inspired air expands your thoracic cavity, reducing the air pressure within the alveoli because P  as V  Air travels from high pressure area (mouth and nose) to low pressure area (alveoli)

Expiration As you breathe out: Your lung volume decreases Diaphragm relaxes (moves up) Intercostal muscles relax (condenses rib cage) Abdominal muscles contract (pushing up against diaphragm) Your lung volume decreases causing higher air pressure in the alveoli Air travels from high pressure area (alveoli) to low pressure area (nose and mouth)

Lung Capacity p. 263

What are some factors affecting lung capacity? Volume in Males (mL) Volume in Females Total Lung Capacity 5900 4400 Vital Capacity Inspiratory Reserve Tidal Volume (rest) Expiratory Reserve 4700 3000 500 1200 3400 2100 1000 Residual Volume