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Distribution of coronary resistance in normal coronary arterial bed.
| Large epicardial arteries | Medium-sized and small arteries | 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% | ||
