Figure 1. Percentage changes in artery and arteriole diameter (% Delta D) under hypoxic conditions with or without N omega -nitro-L-arginine methyl ester (L-NAME) infusion. Under hypoxic conditions, arteries and arterioles smaller than 200 micro meter in diameter became dilated. With L-NAME infusion, attenuation of hypoxic vasodilation was seen in the arteries and arterioles smaller than 200 micro meter, the difference being significant in those vessels. *P < 0.05.