Question

3. In an experiment to demonstrate the mechanism of breathing by using a bell jar, two balloons in the bell jar and a rubber sheet tied to the open end of bell jar : i. What does the space in the bell jar represent? ii. What do the balloons in the bell jar represent? iii. What does the rubber sheet tied over the open end of bell jar represent ?

Answer 1

i) the space in the bell jar represents the chest cavity

ii) the balloons represent the lungs

iii) the rubber sheet tied over the open end represents the diaphragm.

hope it helps you

please mark it brainliest

Answer 2

In the experiment to demonstrate the mechanism of breathing using a bell jar;

1. The space in the bell jar represents the thoracic cavity or the chest cavity. The thoracic wall protects this hollow space within the human body. The ribcage, fascia, and muscles together constitute the thoracic wall.

2. The balloons in the bell jar represent the lungs. The expansion and contraction of the balloons denote inhalation and exhalation.

3. The rubber sheet tied over the open end of the bell jar represents the diaphragm. During inhalation, the contraction and downward movement of the diaphragm occurs and during exhalation, relaxation and upward movement of the diaphragm take place.