Which of the Following Statements Are True of Coronary Circulation

Multiple Choice

Which of the following statements are true of coronary circulation (Select all that apply) ?

A) The coronary arteries are branches of the ascending aorta.
B) The blood in the coronary arteries is high in oxygen.
C) Blockage of a coronary vessel may cause ischemia and necrosis of cardiac muscle.
D) The coronary veins merge into the coronary sinus,which empties blood into the left atrium.