16.
As the diaphragm contracts, the dome flattens and the diaphragm descends,
thereby increasing the size of the thoracic cavity. This results in decreased air
pressure within the thoracic cavity. The greater air pressure outside the body
forces air into the lungs. (para 1-8a)
17.
The respiratory center located in the brainstem.
(para 1-9a)
18.
Oxygen and carbon dioxide.
(para 1-11)
End of Lesson 1
MD0542
1-15