Describe the adult coronary circulation (50% of marks) and its regulation (50% of marks).
This question was generally well answered. Some candidates did not mention the factors which
are peculiar to the coronary circulation and answered in a generic manner, as if for any vascular
bed. The coronary circulation has a high O2-ER and flow-dependence. Many candidates seemed
to lack a perspective that metabolic demand dominates control of the coronary arterial flow.
The phasic nature of flow was best shown with a diagram and whilst "publication-level" graphs
are not expected, the graph drawn must be factually correct and convey the principal similarities
and differences. While this topic is covered in both Guyton and Ganong, additional detail can be
found in the Mosby physiology monograph series: Cardiovascular Physiology, 10th Edition by
Pappano and Wier,( the replacement of Berne and Levy).
Adult coronary circulation:
Physiological control of coronary circulation:
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