There is some disagreement about the ability of a state to rescind an amendment ratification prior to full ratification. In U.S. history, thus far, no rescinded ratifications have made a difference in the long run, though they certainly have happened, especially to the Reconstruction Amendments, 13 through 15.
The intercostal muscles are a group of 22 pairs of tiny muscles found between the ribs. These muscles play a vital role in the movement of the chest during breathing. They also help to solidify the thoracic region and protect the lungs. The 22 pairs of intercostal muscles are broken down into two groups: 11 pairs of internal intercostals and 11 pairs of external intercostals....
Rating Newest Oldest. Best Answer: &nbsp The intercostal muscles are mainly involved in the mechanical aspect of breathing. There are three principal layers; the external intercostal muscles, which aid in quiet and forced inhalation.They originate on ribs 1-11 and have their insertion on ribs 2-12.The external intercostals are responsible for the elevation of the ribs, and expanding the transverse dimensions of the thoracic cavity.oth the external intercostal muscles and the intercondral elevate the ribs, thus increasing the width of the thoracic cavity, while the diaphragm contracts to increase the vertical dimensions of the thoracic cavity, and also aids in the elevation of the lower ribs.