Which of the muscles below when stimulated will contract and push up on the diaphragm? 1. External intercostals 2. External obliques 3. Internal obliques 4. Rectus abdominous

a. 1, 2, and 3 only
b. 1 and 4 only
c. 2, 3, and 4 only
d. 1, 2, 3, and 4


ANS: C
When the abdominal wall muscles contract, they compress the abdominal cavity. This forces the diaphragm upward and compresses the thoracic cavity. The abdominal muscles include pairs of external oblique, internal oblique, transverse abdominis, and rectus abdominous muscles (Figure 9-27).

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