Atrium (heart) Atrium (heart) The atrium is the upper chamber in which blood enters the heart. There are two atria in the human heart – the left atrium connected to the lungs, and the right atrium connected to the venous circulation. The atria receive blood, and when the heart muscle contracts they pump blood to the ventricles. All animals with a closed circulatory system have at least one atrium/auricle (humans have two atria). The atrium used to be called the "auricle", and that term is still used to describe this chamber in, for example, the "Mollusca", but in humans that name is
Which Side Which Side Which Side Podcast is a political podcast hosted by animal rights activist and Grand Jury resister Jordan Halliday and Jeremy Parkin. It features various guests with discussions involving animal rights, earth rights, atheism, anarchism, and many other topics. Which Side has been releasing episodes every week on iTunes and Stitcher since November 2012. The podcast takes its name from the folk song Which Side Are You On?. Which Side Podcast helped found the Which Side Media Collective which it is also a member of. The collective helps have a central outlet for helping distribute and create radical content.