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Blood capillary morphometry in human atrial myocardium (mean ± SE)
| Capillaries | Newborns | Children | Adults |
|---|---|---|---|
| Diameter (μm) | 6.2 ± 1.9 | 6.2 ± 1.6 | 6.5 ± 1.5 |
| Density (no/mm) | 910 ± 105 | 1217 ± 171* | 1306 ± 137*,† |
The number significantly increased in children and adults compared with newborns (P < 0.001).
The difference between capillary density in children and adults is not significant (P > 0.05).
