Bell Jar Model

Question 1

Label the bell jar model

Answer 1

Tube= Trachea
Bell Jar= Chest wall
Balloons= lungs
Rubber sheet= diaphragm

Question 2

Explain the process

Answer 2

•When we pull the rubber sheet down
•The volume in the jar increases
•The pressure decreases
•The balloons inflate

Question 3

Limitations

Answer 3

• The rubber sheet is pulled down
  but the diaphragm goes from
  arched to flattened.
• The balloons don’t fill the jar. The
  lungs fill the chest.
  *The jar doesn’t move, but the ribs
  do move.

Question 4

Why does the pressure change cause the balloons to inflate

Answer 4

Air pressure falls
Air is drawn in