During inspiration,the diaphragm:

Select the correct option for the given figure (assuming the figure shows expiration).

Inspiration occurs when intra-pulmonary pressure is

In the expiration condition,the diaphragm becomes

What structures are responsible for the breathing process?

State the sequence of events for inspiration (breathing in).
$I$ - Increase in lung volume
$II$ - Decrease in intrapulmonary pressure
$III$ - Contraction of respiratory muscles
$IV$ - Increase in thoracic volume
$V$ - Air rushes into the lungs