Atrium (heart) of blood occurs. In birds, mammals, and some other reptiles (alligators in particular) the partitioning of both chambers is complete. Atrium (heart) The atrium is the upper chamber in which blood enters the heart. There are two atria in the human heart – the left atrium connected to the lungs, and the right atrium connected to the venous circulation. The atria receive blood, and when the heart muscle contracts they pump blood to the ventricles. All animals with a closed circulatory system have at least one atrium/auricle (humans have two atria). The atrium used to be called the "auricle", and
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).