A) coronary sinus; left atrium
B) coronary sinus; right atrium
C) great cardiac vein; right atrium
D) great cardiac vein; superior vena cava
E) inferior vena cava; left atrium

A) The left coronary artery is a branch of the left pulmonary vein.
B) The coronary sinus returns blood to the left atrium.
C) The coronary arteries arise from the pulmonary trunk.
D) The great cardiac vein collects blood from the left anterior surface of the heart.
E) The pulmonary arteries carry blood to the left atrium.

A) endocardium
B) epicardium
C) isocardium
D) myocardium
E) visocardium