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
Which? to own Which? Ltd and retains its own name. Following the deregulation of the gas and electricity industry, "Which?" launched a free online energy comparison service called "Switch with Which?" in 2005, to compare energy tariffs. The service was awarded Energywatch Confidence Code accreditation in 2006. In the 2010 Superbrands index, "Which?" ranked fifth in the "Media — Newspapers and Magazines" category and 256th overall. "Which?" carries out systematic testing of consumer products and financial services, the results of which are published in reports in "Which? magazine" and on the "Which?" website. Tests are carried out on goods, services, and