How to make a bell jar model of the lungs

Asked by admin @ 28/10/2021 in Biology viewed by 269 People

Why does the glass jar fail to function as a rib cage in the breathing mechanism

Answered by admin @ 28/10/2021

Answer: The model, which is air tight, represents the thorax, and air is only able to enter via the glass tube which represents the trachea.

As the rubber sheet is pulled down the volume of the jar increases, the pressure therefore decreases and air is drawn in through the glass tube inflating the balloons, which represent the lungs.

There are a number of similarities and differences between the model and the actual respiratory system.

Glass tube/tracheaAllows air to pass through, splits into twoGlass is rigid and inflexible unlike the cartilage bound trachea

Bell jar/chest cavityAir tightUnable to move, the ribs can move up and out to increase the volume of the thorax

Balloons/lungsCan inflate and deflate, are elastic like the alveoliThe balloons are large open spaces whereas the lungs are made up of millions of individual elastic alveoli

Rubber sheet/diaphragmCan be domed up to decrease the volume in the jarThe diaphragm only flattens, it is not pulled downwards like the rubber sheet.

Take any three non-collinear points a b c and draw triangle a,b,c. through each vertex of the triangle draw a line parallel to the opposite side using ruler and compass

Asked by wiki @ 15/11/2022 in Mathematics viewed by 1514 persons

How to make a bell jar model of the lungs

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