Question

capillary punctures that are deeper than recommended are more painful because pain fibers increase in abundance below 1.5 mm 0.5 mm 1.2 mm 2.4 mm

Explanation:

In human skin, pain - fiber density increases below a certain depth. Capillary punctures deeper than 1.5 mm are more likely to encounter more pain fibers, leading to increased pain.

Answer:

1.5 mm