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These worksheets on Internal Body Parts of a human being are made for Grade 2 & 3 kids. It deals with the most important internal organs â brain, heart, lungs and stomach. There are also worksheets for the most important parts of the skeleton, our vital joints and the muscles. The TOC is as follow.
Between the bony portions of the rib cage are two layers of intercostal muscles: the external intercostal muscles and the internal intercostal muscles (fig. 16.14).xpiration, aided by contraction of abdominal muscles and. such as the scalenes and sternocleidomastoid, internal intercostal muscles, increases intrapulmonary. decreases intrapulmonary pressure to -20 mmHg or. pressure to +30 mmHg or higher.