Estimation of open-loop gain of rapidly acting arterial pressure control system in rats.

The overall open-loop gain of the rapidly acting arterial pressure control system was estimated in rats. Wistar male animals were bled by 6 ml/kg body weight. The open-loop gain of the rapidly acting arterial pressure control system was estimated as the relation between the fall of arterial pressure produced by the haemorrhage and the difference between control arterial pressure and the steady state reached after the recovery of the haemorrhage. The results observed suggest that the rapidly acting arterial pressure control system is less developed in the rat than in others Mammals.