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 1861, the United States was divided between free states and slave states, North vs. South. The Mississippi River became the battleground during the Civil War for control of the river, vital to supply lines and to winning the war. The Union forces pushed on the river from two directions. Moving south, the Union won victories at New Madrid, Missouri, and Memphis, Tennessee.