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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.
1 External intercostal muscles aid in quiet and forced inhalation. 2  They originate on ribs 1-11 and have their insertion on ribs 2-12. 3  The external intercostals are responsible for the elevation of the ribs and bending them more open, thus expanding the transverse dimensions of the thoracic cavity. The external intercostals are responsible for the elevation of the ribs and bending them more open, thus expanding the transverse dimensions of the thoracic cavity. 2  Internal intercostal muscles aid in forced expiration (quiet expiration is a passive process).