074 OXYGEN ABSORBING SURFACE IN THE LUNGS

Paper cups

Some chart papers

MATERIAL REQUIRED

Roll a number of smaller tubes from the chart papers

and stack these inside the larger paper cup until no

more can be packed

The outer cup represents the lungs and the inner tubes

represent the oxygen absorbing tissues inside the lungs.

The surface covered by the model may seem small on the table,

but should we undo the model we have created and spread all

the papers flat on the surface of the table. We shall get a fair

idea of oxygen absorbing surface in our lungs.