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
Rose (given name) of Old English rōse from the Latin rosa; phonetically linked to the Greek rhódon, which is independent of the etymology of the surname Rose. Distinctions can sometimes be made between individuals who derive this given name after the surname and those who are named after the flower. Rhoda, as in Acts 12:12-15, is the Greek equivalent. Rosalia was the name of a 12th-century Sicilian saint. St. Rose of Lima was the first person born in the Americas to be canonized. Rose (given name) Rose is a given female name. It is a late Latin name derived from "rosa", meaning "rose".