Figure 23-2 Mechanics of Ventilation

Use Figure 23-2 to answer the following questions:
-What produces the movement labeled "2"?)
A) rectus abdominis contracts
B) rectus abdominis relaxes
C) diaphragm contracts
D) diaphragm relaxes
E) diaphragm relaxes and rectus abdominis contracts

Question

Figure 23-2 Mechanics of Ventilation
 
Use Figure 23-2 to answer the following questions:
-What produces the movement labeled "2"?)
A) rectus abdominis contracts 
B) rectus abdominis relaxes 
C) diaphragm contracts 
D) diaphragm relaxes 
E) diaphragm relaxes and rectus abdominis contracts

Quizplus · Accepted Answer

The movement labeled "2" is produced by the contraction of the diaphragm, which causes it to flatten and move downward, increasing the volume of the thoracic cavity and decreasing the pressure inside the lungs. This creates a pressure differential that allows air to flow into the lungs.