Question

trunk muscles
the trunk muscles include (1) muscles that move the (1. ) column (most of which are posterior antigravity muscles); (2) anterior thorax muscles, which move the ribs, head, and arms; and (3) muscles of the abdominal wall, which \hold your guts in\ by forming a natural (2. ) and help to move the vertebral column.
anterior muscles (figure 6.17)
pectoralis major
the pectoralis (pek\to-ralis) major is a large fan - shaped muscle covering the upper part of the chest. its origin is from the (3. ), shoulder girdle, and the first six ribs. it inserts on the proximal end of the humerus. this muscle forms the anterior wall of the axilla (armpit) and acts to adduct and flex the arm.
intercostal muscles
the intercostal muscles are deep muscles found between the ribs. (although they are not shown in figure 6.17, which shows only (4. ) muscles, they are illustrated in figure 6.22, p. 214.) the external intercostals are important in breathing because they help to raise the rib cage when you inhale. the internal intercostals, which lie deep to the external intercostals, depress the rib cage, helping to move air out of the lungs when you (5. ) forcibly.

1. superficial 2. exhale 3. vertebral 4. girdle 5. sternum
2. girdle 2. sternum 3. superficial 4. exhale 5. vertebral
3. sternum 2. superficial 3. exhale 4. vertebral 5. girdle
4. exhale 2. vertebral 3. girdle 4. sternum 5. superficial
5. vertebral 2. girdle 3. sternum 4. superficial 5. exhale

Explanation:

1. Muscles that move the vertebral column are relevant here, so "vertebral" for the first blank.
2. Abdominal - wall muscles form a natural girdle to hold organs in place, so "girdle" for the second blank.
3. The origin of pectoralis major is from the sternum, shoulder girdle, and first six ribs, so "sternum" for the third blank.
4. Figure 6.17 shows only superficial muscles, so "superficial" for the fourth blank.
5. Internal inter - costals help move air out of the lungs when you exhale forcibly, so "exhale" for the fifth blank.

Answer:

1. vertebral 2. girdle 3. sternum 4. superficial 5. exhale