Atrium (heart) 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 that term is still used to describe this chamber in, for example, the "Mollusca", but in humans that name is
Arabella (given name) Arabella (given name) Arabella is a female given name of Scottish origin. The earliest known namesake: Arabella de Leuchars (c.1135-1203): was a granddaughter of the Scottish king William the Lion; the earliest English namesake was the granddaughter of Arabella de Leuchars: Arabella de Quincy (c.1186-1258), the daughter of Saer de Quincy, 1st Earl of Winchester. Typically of medieval bearers of the name both these Arabellas are also documented as Orabel[la] and Orabilia, and in documents which Latinize names as Orabilis. A Latin construction which suffixes "orare" with "ābilis" - thus interpretable as "given to prayer" or "entreatable" - Orabilis has