Human Heart, A Life Span For Everyone

The heart  is a muscular organ in humans and other animals, which pumpsblood through the blood vessels of the circulatory system.[1] Blood provides the body with oxygen and nutrients, as well as assists in the removal ofmetabolic wastes.[2] The heart is located in the middle compartment of thechest.[3] In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles.[4][5]Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart.[6] Fish in contrast have two chambers, an atrium and a ventricle, while reptiles have three chambers.[5] In a healthy heart…