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
Angus (given name) Angus (given name) Angus is a masculine given name in English. It is an Anglicised form of the Irish and Scottish Gaelic "Aonghas", which is composed of Celtic elements meaning "one", and "choice". A variant spelling of the Scottish Gaelic name is "Aonghus". The Irish form of the Scottish Gaelic name is "Aengus". A pet form of the given name "Angus" is "Angie", pronounced ""an-ghee"", which represents the Scottish Gaelic "Angaidh". A short form of the given name "Angus" is "Gus", which may be lengthened to "Gussie". The feminine form of "Angus" is "Angusina". The earliest form of the given