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
Brendan (given name) Brendan (given name) Brendan is an Irish masculine given name in the English language. It is derived from the Gaelic name Breandán, which is in turn derived from the earlier Old Irish Brénainn. The Old Welsh "breenhin" is the root of the name, meaning Prince or King. The mediaeval Latin form of the name, Brendanus, has also influenced the modern English and Irish forms. Variant spellings of "Brendan" are Brendon and Brenden. In some cases it is possible that the given name "Brandon" is also a variant of "Brendan". A variant spelling of the Irish "Breandán" is Breanndán. The English