Question

In order to inspire, ____________?
A) Gas pressure in the lungs must increase
B) The intrapulmonary volume must increase
C) The diaphragm relaxes
D) The intrapulmonary volume must decrease

Answer 1

the intrapulmonary volume must increase

Answer 2

v During inspiration, the diaphragm and the intercostal muscles contract. The diaphragm moves downwards increasing the volume of the thoracic (chest) cavity, and the intercostal muscles pull the ribs up expanding the rib cage and further increasing this volume. This increase of volume lowers the air pressure in the alveoli to below atmospheric pressure. Because air always flows from a region of high pressure to a region of lower pressure, it rushes in through the respiratory tract and into the alveoli. This is called negative pressure breathing, changing the pressure inside the lungs relative to the pressure of the outside atmosphere. In contrast to inspiration, during expiration the diaphragm and intercostal muscles relax. This returns the thoracic cavity to it's original volume, increasing the air pressure in the lungs, and forcing the air out.
gas pressure must decrease to accomodate incoming air
intrapumonary volume must increase to create space for air AND to decrease pressure of inflow pv being a constant for any gas

Answer 3

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