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Response from a type D baroreceptor. At lower pressures, these receptors usually fired during diastole. At the nadir, this fibre fired a single action potential (~4 Hz) early in systole; the mean firing rate of type D fibres at the nadir was 22 ± 16 Hz. The main point of difference in the behaviour of type D and type C fibres (not illustrated) is that type C fibres were silent at the nadir (see Table 1)
