Atrium (heart) similar function. Some animals (amphibians and reptiles) have a three-chambered heart, in which the blood from each atrium is mixed in the single ventricle before being pumped to the aorta. In these animals, the left atrium still serves the purpose of collecting blood from the pulmonary veins. In some fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. Among sharks, the heart consists of four chambers arranged serially (and therefore called a serial heart): blood flows into the most posterior chamber, the sinus venosus, and then to the atrium which moves it to
John (given name) Yônāṯān, which means "Gift from YHWH" and thus is a longer version of Nathan. John (given name) John is a common masculine given name in the English language of originally Semitic origin. The name is derived from the Latin "Ioannes" and "Iohannes", which are forms of the Greek name "Iōannēs" (), originally borne by Hellenized Jews transliterating the Hebrew name "Yohanan" (), "Graced by Yah", or (), "Yahweh is Gracious". There are numerous forms of the name in different languages; these were formerly often simply translated as "John" in English but are increasingly left in their native forms (see sidebar).