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.
Freebase(0.00 / 0 votes)Rate this definition: Harlan. Harlan is a 4th-class city in Harlan County, Kentucky, in the United States. It is the eponymous seat of its county. The population was 2,081 at the 2000 census.