How would u use the apparatus shown here to explain to a group of young student how air enters and leaves the?

Question

lungs?Assume that these students rnot familiar with the concept of pressure.

HERE is the apparatus :

rubber stoper

air tight chamber

glass

ballons (as lungs)

bell jar

rubber membrane

handle to pull rubber membrane down

please help me out here,

Answer 1

Yeah sorry I'm a visual learner so I really would need to SEE all that to be able to explain it

Answer 2

As you pull on the handle to bring the membrane down (equivalent to the diaphragm contracting) the balloons will inflate as the liungs do. This is because the pulling of the membrane lowers the pressure in the chamber and so air rushes in from outside to inside and fills the balloons.(From high presure to relatively low pressure.

Pushing the membrane up simply reverses the whole process.