Question

In negative pressure breathing, inhalation results from:

• A. forcing air from the throat down into the lungs
• B. contracting the diaphragm
• C. relaxing the muscles of the rib cage
• D. contracting the abdominal muscles

Answer 1

The correct option is B contracting the diaphragm

During the process of inhalation, the lung volume expands as a result of contraction of the diaphragm & intercostal muscles, thoracic cavity expands, due to this increase in volume, the pressure is decreased.

So, the correct option is 'contracting the diaphragm'.