Heart

The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes. The heart is located in the middle compartment of the mediastinum in the chest.

In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles. Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. Fish in contrast have two chambers, an atrium and a ventricle, while reptiles have three chambers. In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.

Magyar

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Every Now and Then

Every Now and Then may refer to:

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Demi Lovato

Demetria Devonne "Demi" Lovato (/ˈdɛmi loʊˈvɑːtoʊ/ DEM-ee loh-VAH-toh or lə-VAH-toh) (born August 20, 1992) is an American singer, songwriter, actress and model who made her debut as a child actress in Barney & Friends. In 2008, Lovato rose to prominence in the Disney Channel television film Camp Rock and signed a recording contract with Hollywood Records. Musically, Lovato is considered a pop and pop rock. She released her debut album, Don't Forget, that September; it debuted at No. 2 on the U.S. Billboard 200 and has been certified gold by the Recording Industry Association of America (RIAA) for sales of over 530,000 copies. In 2009, Lovato received her own television series, Sonny with a Chance. Her second album, Here We Go Again, was released that July and debuted at number one on the U.S. Billboard 200, and it has been certified gold by the Recording Industry Association of America (RIAA) for sales of over 650,000 copies. Its title track became her first single to break the top 20 of the Billboard Hot 100, reaching number 15, and was certified platinum.

Turn Around

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