Coordinated contractions of cardiac muscle cells in the heart propel blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems.This complex mechanism illustrates systole of the heart.oordinated contractions of cardiac muscle cells in the heart propel blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems.
The Union army was intent on gaining control of the Mississippi River in order to divide the Confederacy and weaken its economy. Taking control of the Mississippi prevente â¦ d the western Confederate states of Arkansas, Texas, and Louisiana from providing men and material for the Confederate army.
In the 1780s, the western border of the newly independent United States stretched to the Mississippi River. The United States reached an agreement with Spain for navigation rights on the river and was content to let the feeble colonial power stay in control of the area.