Examine the figure shown.During negative pressure breathing,________.
A) the diaphragm moves downward and the rib muscles contract, increasing the size of the chest cavity and decreasing the air pressure within the chest cavity
B) the nasal cavities expand and the diaphragm relaxes
C) the diaphragm and rib muscles contract, decreasing the size of the chest cavity and increasing the pressure within the chest cavity
D) the diaphragm moves downward and the rib muscles relax, increasing the size of the chest cavity and decreasing the air pressure within the chest cavity

Question

Examine the figure shown.During negative pressure breathing,________. 
A) the diaphragm moves downward and the rib muscles contract, increasing the size of the chest cavity and decreasing the air pressure within the chest cavity 
B) the nasal cavities expand and the diaphragm relaxes 
C) the diaphragm and rib muscles contract, decreasing the size of the chest cavity and increasing the pressure within the chest cavity 
D) the diaphragm moves downward and the rib muscles relax, increasing the size of the chest cavity and decreasing the air pressure within the chest cavity

Quizplus · Accepted Answer

Negative pressure breathing involves the contraction of the diaphragm and rib muscles, which increases the size of the chest cavity and decreases the air pressure within it. This creates a pressure gradient where air flows into the lungs. Option B is incorrect as it describes no such mechanism. Option C is incorrect as it describes the process of expiration, not inspiration. Option D is also incorrect as the diaphragm contracts during inspiration while it relaxes during expiration.

Examine the Figure Shown.During Negative Pressure Breathing,________