I right atrium Completion Questions 1. septum 2. Valves prevent blood or lymph from flowing backward. The septum divides the heart into right and left sides separating the oxygenated and deoxygenated blood. Short Answer Questions 1. The left ventricle has to be more muscular as it pumps blood to the entire body.
Oxygenated blood is higher in oxygen and lower in carbon dioxide than deoxygenated blood.
Multiple Choice answers 1. 1 2.