The Onion is an American digital media company and newspaper organization that publishes satirical articles on international, national, and local news. Based in Chicago, the company originated as a weekly print publication on August 29, 1988 in Madison, Wisconsin. In the spring of 1996, The Onion began publishing online. In 2007, the organization began publishing satirical news audio and video online, as the Onion News Network.
The heart has four chambers: two atria and two ventricles. The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle. The right ventricle pumps the oxygen-poor blood to the lungs. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.