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VENTILATION IN HUMANS (ie the mechanism of breathing)

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Presentation on theme: "VENTILATION IN HUMANS (ie the mechanism of breathing)"— Presentation transcript:

1 VENTILATION IN HUMANS (ie the mechanism of breathing)

2 Inspiration (breathing in) (Inhalation / breathing in)Expiration (Exhalation / breathing out)

3 Lungs deflate.Lungs inflate. Air is forced out and……Air rushes in and……. As a result, the pressure inside the lungs is increased compared to the air outside the body. As a result, the pressure inside the lungs is decreased compared to the air outside the body. The volume inside the lungs is decreased. The volume inside the lungs is increased. The Diaphragm muscle relaxes and the Diaphragm becomes dome shaped The Diaphragm muscle contracts, causing the diaphragm to flatten. this pulls the ribs downwards and inwards. this pulls the ribs upwards and outwards. External Intercostal Muscles relax,External Intercostal Muscles contract, to the External Intercostal Muscles and Diaphragm. No nervous impulses travel from the Medulla Oblongata in the Brain, Nervous impulses travel from the Medulla Oblongata in the Brain, BREATHING OUT (Exhalation / Expiration) BREATHING IN (Inhalation / Inspiration)

4 BREATHING IN (Inhalation / Inspiration) BREATHING OUT (Exhalation / Expiration) Nervous impulses travel from the Medulla Oblongata in the Brain, No nervous impulses travel from the Medulla Oblongata in the Brain, to the External Intercostal Muscles and Diaphragm. External Intercostal Muscles contract,External Intercostal Muscles relax, this pulls the ribs upwards and outwards. this pulls the ribs downwards and inwards. The Diaphragm muscle contracts, causing the diaphragm to flatten. The Diaphragm muscle relaxes and the Diaphragm becomes dome shaped The volume inside the lungs is increased. The volume inside the lungs is decreased. As a result, the pressure inside the lungs is decreased compared to the air outside the body. As a result, the pressure inside the lungs is increased compared to the air outside the body. Air rushes in and…….Air is forced out and…… Lungs inflate.Lungs deflate.

5 Answer missing words task on HB p6. Now do the graph task at the bottom of HB p6. NB) Copy of HB graph is on next slide!

6

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