Final answer:
The sternocostal surface of the heart is primarily formed by the right ventricle, which is the anterior chamber that receives deoxygenated blood from the right atrium and pumps it to the lungs. Therefore, the answer to the question is D) Right ventricle.
Step-by-step explanation:
The sternocostal surface of the heart, which is the part of the heart's anterior surface that lies deep to the sternum and costal cartilages, is primarily formed by the right ventricle.
Therefore, the answer to the question is D) Right ventricle. When we look at the anatomy of the heart, the right ventricle is the chamber that is positioned most anteriorly, receiving deoxygenated blood from the right atrium and pumping it to the lungs for oxygenation through the pulmonary trunk.
To address the reference information provided, the human heart consists of four chambers: the right atrium, the left atrium, the right ventricle, and the left ventricle. The right atrium initially receives blood from the systemic circuit, making it the receiving chamber for deoxygenated blood that will pass to the right ventricle.
The left ventricle, being the primary pumping chamber of the heart on the lower left side, ejects oxygenated blood into the systemic circuit via the aorta.