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
Luca (given name) Luca (given name) Luca (also spelt Louca, Luka, Louka, Lucca) is a given name used predominantly for males, mainly in Latin America, Italy, Spain, Portugal, Romania, Russia, Serbia, Slovenia, Croatia, Bulgaria, Greece, Georgia and Armenia. It is derived from the Latin name Lucas, which itself is derived from the Latin word "lux" (light). It may also come from the Latin word "lucus" meaning "sacred wood" (a cognate of lucere). The name is common among Christians as a result of Luke the Evangelist. Similarly, the name Luka is also commonly found as a male given name in Eastern Europe and particularly