Which accessory muscles are active during resting and active inspiration and pull up on all the ribs expanding the thorax?
a. External intercostals
b. Internal intercostals
c. Scalenes
d. Sternocleidomastoids
ANS: A
The external intercostals (Figure 9-22) originate on the upper ribs and attach to the lower ribs. The fibers of these muscles run at an oblique angle between the ribs. When they generate tension, they lift the ribs upward and cause the thoracic cavity to enlarge the thorax.
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