ventilation- the lungs
- Created by: siobhan
- Created on: 04-05-13 14:32
View mindmap
- Ventilating the lungs
- the lungs are situated in the thorax, inside the rib cage and above the diaphragm, which separates the lungs from the abdomen
- breathing in
- the intercostal muscle between the ribs and the diaphragm contract
- the volume of the thorax increases
- the pressure in the thorax decrease and air is drawn in
- the ribages moves up and out and the diaphragm flattens
- breathing out
- the intercostal muscle between the ribs and the diaphragm relax
- the ribcage moves down and in and the diaphragm becomes domed
- the volume of the thorax decreases
- the pressure increases and air is forced out
- the movement of air in and out of the lungs is known as ventilation
Comments
No comments have yet been made