Atrium (heart) of blood occurs. In birds, mammals, and some other reptiles (alligators in particular) the partitioning of both chambers is complete. 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
The Heart String & How to Pull It 21 March and finishing on 8 April. Pledgers were offered various basic packages that included a physical copy of the album, a digital download of the album, a download of what became the "Chemicals EP", an album-themed T-shirt and an album-themed poster. All of the basic packages included the option to download the album a few days in advance of the physical release. Additionally, there were several special packages that were offered at premium prices. All of the special packages included a digital download of the album. The Heart String & How to Pull It The Heart String & How