Final answer:
RV infarction or cor pulmonale typically affects the entirety of the right ventricle, which is responsible for pumping deoxygenated blood into the pulmonary trunk and then to the lungs via the right and left pulmonary arteries.
Step-by-step explanation:
RV infarction or cor pulmonale usually involves the full length of the right ventricle of the right ventricle. The right ventricle receives deoxygenated blood from the right atrium through the tricuspid valve and pumps it into the pulmonary trunk. This pulmonary trunk then divides to form the right and left pulmonary arteries, carrying blood to each lung for oxygenation.
The right coronary artery plays a crucial role in supplying blood to the heart tissue itself, including the right atrium, portions of both ventricles, and the heart conduction system. When the right ventricle is compromised, as in the case of cor pulmonale or RV infarction, its ability to pump blood effectively to the lungs may be significantly reduced.