Atrium (heart) similar function. Some animals (amphibians and reptiles) have a three-chambered heart, in which the blood from each atrium is mixed in the single ventricle before being pumped to the aorta. In these animals, the left atrium still serves the purpose of collecting blood from the pulmonary veins. In some fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. Among sharks, the heart consists of four chambers arranged serially (and therefore called a serial heart): blood flows into the most posterior chamber, the sinus venosus, and then to the atrium which moves it to
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