Ischemic heart disease is a condition in which:

A) a portion of the heart muscle dies because of a prolonged lack of oxygen.
B) there is a decrease in blood flow to one or more portions of the heart muscle.
C) the coronary arteries dilate, thus preventing effective blood flow to the heart.
D) an acute event leads to a significant decrease in the pumping force of the heart.

Answer: B) there is a decrease in blood flow to one or more portions of the heart muscle.