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A heart is an organ that pumps blood, found in both the human body and the Melmacian body.

A Melmacian's heart was found in the head. (Episode: "A.L.F.") ALF crosses his head, when he says "cross my heart" and Rhonda does the same in the episode "Help Me, Rhonda."

It is known that Melmacians have ten major organs, eight of which are stomachs. It is presumed that the heart is one of the other two major organs.

(see also Melmacian Physiology).