Heart depending on what is counted as a chamber. The atrium and ventricle are sometimes considered "true chambers", while the others are considered "accessory chambers". Primitive fish have a four-chambered heart, but the chambers are arranged sequentially so that this primitive heart is quite unlike the four-chambered hearts of mammals and birds. The first chamber is the sinus venosus, which collects deoxygenated blood from the body through the hepatic and cardinal veins. From here, blood flows into the atrium and then to the powerful muscular ventricle where the main pumping action will take place. The fourth and final chamber is the
Nea (given name) official name day for Nea, Neea, Linnea and Vanamo. Nea (given name) Nea and Neea are Finnish female given names. The name has been in the Finnish Almanac since 1995, but the name has been considerably in use much earlier. At the end of 2015 according to the Population Register Center, approximately 7,140 women have been named Nea and 3,110 women have been named Neea. Nea and Neea are shortened versions of Linnea which is a female given name of Swedish origin. The name Linnea is linked to the famous 18th-century Swedish scientist Carl Linnaeus, who was ennobled as Carl