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
Raven (given name) Raven (given name) Raven is a unisex given name in the English language. In the United States of America, the name is more commonly used as a feminine name, and has ranked amongst the top 1,000 feminine names given to baby girls since 1977. The name originates from the English vocabulary word "raven", which in turn is ultimately derived from the Old English "hræfn". As a masculine name, "Raven" parallels the Old Norse "Hrafn", and the Old English "*Hræfn", which both mean "raven". As a feminine name, "Raven" is among several other names derived from birds; names such as "Dove",