Pain due to poor coronary blood flow (angina) may be relieved by

A. True  Pain sensory fibres from the heart travel with the sympathetic nerves.

B. True  In anaemia, the capacity of the blood to deliver oxygen is decreased but cardiac work increases due to the rise in cardiac output.

C. False  Cold vasoconstriction raises arterial pressure and so increases myocardial work.

D. False  These increase heart rate and force and so increase myocardial work

E. True  By reducing arterial pressure, vasodilator drugs such as nitrates reduce myocardial work.