, 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.
Text Preview. The Importance of the Emancipation Proclamation. The Emancipation Proclamation was delivered by Abraham Lincoln at the start of the third year of the Civil War. The purpose of the Civil War was to bring back into the Union those states that had decided to withdraw as a result of disagreement about slavery.he Emancipation Proclamation was delivered by Abraham Lincoln at the start of the third year of the Civil War. The purpose of the Civil War was to bring back into the Union those states that had decided to withdraw as a result of disagreement about slavery.