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
Brandon (given name) Brandon (given name) Brandon is a masculine given name which originates from two or possibly three separate sources, two Celtic, the other, Anglo-Saxon, and has historically been used by these different cultures independently. Today, most people with the name do not have any connection or lineage with any of these sources and use them as if they were the same name. In the instances of the Celtic origins, it is either a variant of the Irish masculine given name, Breandán, or descended from the Old Welsh name Brân, meaning "crow". The Anglo-Saxon origin is the surname "Brandon". The given name