Search results with tag "Intercostal"

Rate of diffusion surface area x concentration difference ...

Inspiration • The diaphragm contracts and flattens downwards • The external intercostal muscles contract, pulling the ribs up and out • Therefore the volume of the thorax increases (and so the lung and alveoli volume) • this decreases the air pressure in the alveoli, so • air flows in to equalise the pressure Normal expiration • The diaphragm relaxes and curves upwards

  Intercostal