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15.1 In a healthy woman the local oxygen demand sometimes exceeds delivery
by the bloodstream to
a. skeletal muscles during exercise.
b. the myocardium during exercise.
c. the skin during hot weather.
d. the uterus during labour.
e. the cerebral cortex during exercise.
15.2 The vascular resistance of
a. ventricular myocardium increases as cardiac output increases.
b. skeletal muscle falls during dynamic exercise.
c. the cutaneous circulation is raised in cold weather.
d. the motor cortex increases during voluntary movement.
e. the cerebral circulation is lower than that of the pulmonary circulation.
The coronary circulation
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15.3 In the coronary circulation of a healthy ventricle,
a. the myocardial capillary density is several times greater than in skeletal muscle.
b. the coronary venous O2 concentration is about the same as in the right ventricle.
c. the blood flow is almost directly proportional to the cardiac output.
d. the blood flow is higher during ventricular ejection than during diastole.
e. the blood flow can be increased by adrenaline.
15.4 In the human coronary circulation during exercise,
a. increased O2 transfer is achieved mainly through increased O2 extraction
rather than increased blood flow.
b. blood flow is increased by sympathetic cholinergic nerves.
c. increased cardiac sympathetic fibre activity raises coronary perfusion.
d. autoregulation is suppressed.
e. a rise in interstitial adenosine may contribute to vasodilatation.
15.5 When a major human coronary vessel is obstructed by thrombosis,
a. abundant arterio-arterial anastomoses greatly limit the ischaemic area.
b. local hypoxia and acidosis cause downstream vasodilatation.
c. a sharp pain is experienced over the heart on the left side of the chest.
d. the ECG often shows ST segment elevation.
e. the plasma level of myocardial lactic dehydrogenase falls.
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