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.
Olin, IA. Olin is a city in Jones County, Iowa, United States. The population was 716 at the 2000 census. It is part of the Cedar Rapids Metropolitan Statistical Area. Olin is located at 41Â°59â²51â³N 91Â°8â²24â³W / 41.9975Â°N 91.14Â°W / 41.9975; -91.14 (41.997599, -91.139924). According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.6 kmÂ²), of which, 1.0 square miles (2.6 kmÂ²) of it is land and 1.00% is water.