Question

angina pectoris is chest pain caused by reduced
multiple choice
action potentials from sa node.
blood supply to cardiac muscle.
stimulation of the myocardium.
contractility of the heart.
fluid in the pericardial sac.

Explanation:

Angina pectoris is chest pain due to reduced blood - supply to the heart muscle (cardiac muscle). When the blood supply is not sufficient to meet the oxygen demands of the cardiac muscle, it causes pain.

Answer:

blood supply to cardiac muscle.