Bell Jar Model and Human Respiratory System Quiz

Examine the first diagram. How does pulling down the rubber sheet at the bottom of the model demonstrate the process of inhalation in the human respiratory system?

• It increases the pressure inside the jar, causing the balloons to deflate.

• It decreases the pressure inside the jar, causing the balloons to inflate.

• It increases the temperature inside the jar, causing the balloons to expand.

• It decreases the temperature inside the jar, causing the balloons to contract.

Based on the second diagram, what role does the diaphragm play during inhalation?

• The diaphragm relaxes and moves upward, pushing air out of the lungs.

• The diaphragm contracts and moves downward, drawing air into the lungs.

• The diaphragm contracts and moves upward, drawing air into the lungs.

• The diaphragm relaxes and moves downward, pushing air out of the lungs.

If the rubber sheet in the bell jar model is pushed upward, what would happen to the balloons inside, and why?

• The balloons would inflate because air pressure increases.

• The balloons would deflate because air pressure inside the jar increases.

• The balloons would inflate because air pressure decreases.

• The balloons would deflate because air pressure outside the jar increases.

Compare the bell jar model to the human respiratory system. What does the rubber sheet represent, and why is this comparison useful?

• The rubber sheet represents the rib cage, showing how it protects the lungs.

• The rubber sheet represents the diaphragm, showing how its movement changes lung volume.

• The rubber sheet represents the trachea, showing how air enters the lungs.

• The rubber sheet represents the lungs, showing how they expand and contract.

Using evidence from the diagrams, explain why air is drawn into the lungs when the diaphragm contracts.

• The contraction of the diaphragm increases lung pressure, forcing air in.

• The contraction of the diaphragm decreases lung pressure, allowing air to flow in.

• The contraction of the diaphragm increases the temperature in the lungs.

• The contraction of the diaphragm decreases the volume of the lungs.

If a student wanted to model exhalation using the bell jar model, what action should they take with the rubber sheet, and what would be the expected result?

• Pull the rubber sheet down; the balloons will inflate.

• Push the rubber sheet up; the balloons will deflate.

• Pull the rubber sheet down; the balloons will deflate.

• Push the rubber sheet up; the balloons will inflate.

Analyze the second diagram and explain how the movement of the ribs assists in the process of inhalation.

• The ribs move downward and inward, decreasing chest volume.

• The ribs move upward and outward, increasing chest volume.

• The ribs remain stationary, allowing the diaphragm to do all the work.

• The ribs move upward and inward, decreasing chest volume.

Suppose the bell jar model is sealed tightly at the top. Predict what would happen if you tried to inflate the balloons by pulling the rubber sheet down, and explain your reasoning.

• The balloons would inflate because air can still enter.

• The balloons would not inflate because no air can enter the jar.

• The balloons would deflate because air is forced out.

• The balloons would burst due to increased pressure.

Evaluate the effectiveness of the bell jar model in representing the human respiratory system. What is one limitation of this model?

• The model does not show the movement of the diaphragm.

• The model does not allow air to enter or leave the balloons.

• The model does not accurately represent the branching of the bronchi.

• The model does not show the exchange of gases in the alveoli.

Imagine a scenario where the diaphragm is unable to contract properly. Using your understanding of the diagrams, predict how this would affect breathing.

• Breathing would become easier because the lungs would inflate automatically.

• Breathing would be unaffected because the ribs do all the work.

• Breathing would become difficult because the lungs would not expand properly.

• Breathing would become faster because the diaphragm is not needed.