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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.
The external intercostal muscles are responsible for forced and quiet inhalation. They raise the ribs and expand the chest cavity, and originate from ribs one through 11, with insertion from ribs two to 12. The internal intercostal muscles are responsible for forced exhalation.he three layers are: external intercostal muscles, internal intercostal muscles, and the innermost intercostal muscles. These muscles are innervated and supplied with blood by the intercostal nerves, intercostal veins, and intercostal arteries.