26 May From the down demands, this type of receptors always fired during diastole

In the Good, the higher product began firing throughout the systole, due to the fact quicker device went on so you're able to flames throughout diastole

4 Hz) early in systole; the imply capturing speed from type D fibres within nadir try 22 ± sixteen Hz. The main point from difference in the brand new actions regarding style of D and kind C fibres (maybe not illustrated) is that sorts of C muscles was basically hushed at the nadir (discover Dining table 1)

Record of two type D baroreceptors. The frequency of the larger unit is shown in the bottom trace. At low pressures (left of A) both receptors fired during diastole. P _th for the larger unit is the pressure at A, while P _th for the smaller unit is the pressure at B. From their respective P _th values each fibre showed an increase in firing rate with increasing pressure. The mean discharge for the larger unit was identical at the lowest and highest pressures shown in this figure (six action potentials per cycle)

We used ramps of increasing pressure to examine the discharge characteristics of the baroreceptors. It is well established that response curves based on ramps of decreasing pressure demonstrate hysteresis, and a higher value for P _th is observed on the descending limb of a ramp. To see whether the direction of pressure change affected the discharge pattern of type C and D fibres, we examined our records for ramps of descending pressure. We had not intended to perform descending ramps, so we searched the records for sections where a steady decline in AP occurred at the time when the cuff around the inferior vena cava was inflated to initiate an ascending ramp. An example of one of these descending ramps and the following ascending ramp is shown in Fig. 7.