Final answer:
Cor pulmonale involves right heart failure from any cause and is characterized by the right side of the heart being unable to pump blood efficiently through the lungs.
Step-by-step explanation:
Cor pulmonale involves right heart failure from any cause. It occurs when the right side of the heart is unable to pump blood efficiently through the lungs. This condition can be caused by conditions such as chronic obstructive pulmonary disease (COPD) or pulmonary hypertension, which result in damage to the alveolar-capillary membrane.