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
Dolores (given name) Dolores (given name) Dolores is a feminine given name of Spanish origin. In an etymological sense, the name Dolores from the Spanish word "dolores", which is the plural form of "dolor", meaning either sorrow or pain, and word can be traced even further back, into Latin. However, the usage of Dolores as a given name has its origins in the strong influence that the Roman Catholic Church has on Spain and, by extension, Spanish-speaking countries. The name is a reference to Nuestra Señora de los Dolores, one of the many titles of Mary, Mother of Jesus, typically translated to Our