Q. A 67-year-old male is brought to the emergency department by his wife due to chest pain, shortness of breath and diaphoresis for the past 12 hours. He has a history of hypertension and hypercholesterolemia and is taking hydrochlorothiazide and a statin. The patient claims he has been unable to refill his prescriptions for the last week due to a recent blizzard that snowed them in. An ECG shows sinus rhythm with ST-segment elevation in leads II, III, and aVF. His troponin level is 0.03. He is immediately taken to the catheterization lab and findings show an occlusion of the proximal right coronary artery. According to these findings, which part of the heart is affected?