, Physiologist. 1  In four chambered avian and mammalian hearts, the two upper chambers are known as the atria. The atria are believed to act as primer pumps which boost the end diastolic volume (the volume at the end of ventricular filling) just before contraction of the ventricles.
Disunion follows the Civil War as it unfolded. New Orleans was the jewel of the Confederacy. In addition to being the Southâs largest city, it boasted considerable industry that produced ironclads, munitions and uniforms, among other items. More important, it controlled access to the Mississippi River from the Gulf of Mexico.
Hence its importance. Points of the river between Vicksburg and Port Hudson were held as dependencies; but their fall was sure to follow the capture of the former place. Vicksburg was important to the enemy because it occupied the first high ground coming close to the river before Memphis. From there a railroad runs east, connecting with other roads leading to all points of the Southern States. A railroad also starts from the opposite side of the river, extending west as far as Shreveport, Louisiana.