CVS DISORDERS. Anatomy of the Heart ✅ Definition:The heart is a muscular, hollow organ that functions as a pump to circulate blood throughout the body. It is located in the mediastinum, between the lungs, behind the sternum, and tilted slightly to the left. ✅ Structure of the Heart: ✅ Chambers of the Heart: Chamber Function Clinical Relevance Right Atrium (RA) Receives deoxygenated blood from the body (via superior & inferior