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
Heather (given name) For example, the name Heidi in German resembles "Heidekraut", which is the German word for the Heather shrubs, though the name Heidi usually is attributed to "ruler". The name Erica actually has two meanings, one of which is related to the Heather plant whose Latin name is "Ericaceae". Its other meaning is equal to that of the German meaning of Heidi, meaning "ruler". This leaves the impression that the shrub name and the meaning of "ruler" are similar, or it is a large coincidence. Heather (given name) Heather is a common English speaking nation given name, for girls. The name