• A hollow muscular organ which receives the blood from the veins and pumps it into the arteries.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• A hollow organ located slightly to the left of the middle portion of the chest. It is composed of muscle and it is divided by a septum into two sides: the right side which receives de-oxygenated blood from the body and the left side which sends newly oxygenated blood to the body. Each side is composed of two chambers: the atrium (receiving blood) and ventricle (ejecting blood).
  NCI
  U.S. National Cancer Institute, 2021
• Hollow, muscular organ that maintains the circulation of the blood.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Organ with cavitated organ parts, each instance of which is continuous with some systemic and pulmonary arterial and venous trees. Examples: There is only one heart.
  Foundational Model of Anatomy
  University of Washington, 2017
• Organ with cavitated organ parts, which is connected to the systemic and pulmonary arterial and venous trees. Examples: There is only one heart.
  Digital Anatomist
  University of Washington, 2003
• The hollow, muscular organ that maintains the circulation of the blood.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• Intraoperatively, the anatomy of the heart is viewed from the right side of the supine patient via a median sternotomy incision. The structures initially seen from this perspective include the superior vena cava, right atrium, right ventricle, pulmonary artery, and aorta.
  Medscape
  WebMD, 2025
• Heart, organ that serves as a pump to circulate the blood. It may be a straight tube, as in spiders and annelid worms, or a somewhat more elaborate structure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks. In fishes the heart is a folded tube...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2025