role of diaphragm and interocostal muscles

Cards (5)

function of respiratory system is to deliver oxygen into body by breathing in (inspiration) and breathing out (expiration)
breathing in
when breathing in air, intercostal muscles pull ribcage upwards and outwards and diaphragm flattens inwards
breathing in
result of these two movements is an increase in volume and decrease in pressure, which forces air into lungs so they inflate
breathing out
the diaphragm lifts back into a dome shape and the intercostal muscles pull ribcage inwards and downwards
breathing out
these two movements force carbon dioxide out of lungs and they deflate