From the vena cava (superior and inferior), the blood enters the heart (right atrium), is pumped into the right ventricle, and then pumped into the lungs (through the Pulmonary Arteries), where carbon dioxide is exchanged for oxygen.
Harlan, Iowa. Harlan is a city in Shelby County, Iowa, United States, along the West Nishnabotna River. The population was 5,106 at the 2010 census. It is the county seat of Shelby County.
Des Moines has an estimated population of 209,000 people, up from 203,000 in 2010. This means Des Moines ranks 104th in the United States in terms of population, with a density of 2,517 people per square mile or 972 per square kilometer.