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.
Hardin County, Iowa. Hardin County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 17,534. The county seat is Eldora. The county was named in honor of Col. John J. Hardin, of Illinois, who was killed in the MexicanâAmerican War.