Question

Study the given experimental setup. What happens when the rubber sheet is pulled down?

(i) Air pressure inside the bell jar increases.
(ii) The balloons inside the jar expand.
(iii)This is similar to the expansion of the lungs during inhalation.
(iv)This is similar to the contraction of the lungs during exhalation.

Answer 1

Answer:

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Explanation:

In the given experimental set up, when the rubber sheet is pulled down, the space in the bottle increases and the balloons inside the jar get inflated. If the balloons represent the lungs, the rubber sheet is the diaphragm and the plastic bottle is equivalent to the chest cavity, then this set up represents inhalation.

Answer 2

Answer:

(iii)This is similar to the expansion of the lungs during inhalation.

Explanation:

• The bell jar model can be used to simulate the process of ventilation as a sequence of thoracic pressure fluctuations. The model's components stand in for various respiratory system components.
• Air may only enter the airtight model, which represents the thorax, through the glass tube, which stands in for the trachea.
• As the rubber sheet is lowered, the jar's volume rises, the pressure falls as a result, and air is taken into the jar through the glass tube to inflate the balloons, which stand in for the lungs.
• A chemical process called respiration releases energy from food. The exchange of gases necessary for respiration takes place in the respiratory system.

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