Table 1 Distribution of coronary resistance in normal coronary arterial bed.
| Â | Large epicardial arteries | Medium-sized and small arteries | Â | Arterioles | Capillaries |
|---|---|---|---|---|---|
Diameter | >1000 μm | 1000–100 μm. | 100–10 μm | <10 μm | |
% of total resistance | 5% |  | 15–25% 400–100 μm | 50–60% | 20% |
% length of coronary bed | 5–10% | 15–25% |  | 60–75% |  |