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Numbers of small and large venules in a 1 mm segment of choroid from saline (saline), phentolamine (phentolamine) and propanolol (propanolol) treated rats. Small venules in the 10 μm grouping have diameters between 10 – 14.9, and larger venules in the 15 μm group have diameters of 15 μm or greater. Data are expressed as the mean±s.e.mean for 4 – 5 rats in each group. *P<0.01 vs saline infused rats.
