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
Matthew (given name) Matthew (given name) Matthew is an English language given name. It ultimately derives from the Hebrew name "מתתיהו" ("Matityahu") which means "Gift of Yahweh". The Hebrew name "" (Matityahu) was transliterated into Greek to "Ματταθίας" ("Mattathias"). It was subsequently shortened to Greek "Ματθαῖος" ("Matthaios"); this was Latinised as "Matthaeus", which became "Matthew" in English. The popularity of the name is due to Matthew the Apostle who in Christian theology is one of the twelve apostles of Jesus and the author of the Gospel of Matthew. Maiú and Maidiú are Gaelic forms of the name Matthew, and were brought to Ireland