Figure 6. Effect of adenosine, applied on the dorsal surface of the medulla oblongata, on phrenic nerve discharge and arterial blood pressure in anaesthetised rats.
A, raw data illustrating changes in the phrenic nerve activity and arterial blood pressure after application of adenosine (100 μM, 200 μl) on the dorsal surface of the medulla oblongata. Arrow indicates time of application. B, means ±s.e.m. (in bursts min−1) of the respiratory frequency (Rf) 30 s after application of adenosine or saline on the dorsal surface of the medulla oblongata. * Significant difference, P < 0.05.