Fig. 9.

In a Kölliker-Fuse-implanted goat, the attenuation in the third phase of the V̇i response to hypoxia was due specifically to actions of atropine, as opposed to any effect from MD of mock cerebrospinal fluid (mCSF) alone. Note that during the third phase of the hypoxic ventilatory response, the post-mCSF MD (purple triangles) and postimplant (blue triangles) series were closely aligned, whereas the post-Atr MD (red squares) series was attenuated relative to the 2 aforementioned series. Each series is an average of 2 studies, with data shown in 60-s bins.