Figure 3.

Diagram of the model used to model the pial arteriole or the rat tail artery. It is assumed that there is uniform rate of CO production (M) in the arterial wall (thickness = T). The outer wall of the artery is assumed to be impermeable to CO, and the diffusion of CO to the blood sink (P_CO = P_B) sets up a steady state P_CO gradient (= P(r)) in the vessel wall.

Abbreviation: P_CO, CO partial pressure; P(r), CO partial pressure at radial position r in arteriole wall; P_B, CO partial pressure of blood; a, radius of arteriole lumen; R, outer wall arteriole radius; T, arteriole wall thickness.