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
Christos (given name) Christos (given name) Christos is a common Greek given name. In Greek, it may be spelled Χρίστος ("Chrístos") or Χρήστος ("Chrēstos"), which are pronounced identically ("cf." iotacism). The Greek name Χρίστος is derived from the earlier word χριστός (note the difference in accentuation), meaning "anointed" and which became the Christian theological term for the Messiah. The spelling of the Greek name Χρήστος suggests a derivation from the word χρηστός, which in earlier forms of the language principally meant "useful", and in modern Greek means "ethical, righteous, good, just, upright, virtuous". It is more likely, however that the form Χρήστος is