Anatomy students who are learning about the heart for the first time. This is part of a presentation in which the instructor will go through each step clearly. The next slide (not included) is supposed show that these steps are actually taking place at the same time on each side of the heart i.e blood is entering the atria at the same time on both sides. Blood is also getting pumped out of the ventricles at the same time. Rendered in Adobe Illustrator and InDesign.