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.
Avoca, IA (Iowa) Houses and Residents. Total population: 1,506 (Urban population: 0, Rural population: 1,623 (6 farm, 1,617 nonfarm)) Houses: 710 (665 occupied: 454 owner occupied, 162 renter occupied) Housing density: 366 houses/condos per square mile.