 This treatise shows that the heart, its vessels, liver, spleen, kidneys, hypothalamus, uterus and bladder were recognized, and that the blood vessels were known to emanate from the heart.Other vessels are described, some carrying air, some mucus, and two to the right ear are said to carry the "breath of life", while two to the left ear the "breath of death".The Ebers Papyrus (c. 1550 BC) features a treatise on the heart.It notes that the heart is the center of blood supply, and attached to it are vessels for every member of the body.