Figure 3.

Nifedipine has only a small effect on nerve evoked constrictions. Typical responses in medium (a) and large (b) arteries. Nifedipine (1 μM) has little effect, both when applied alone, and when prazosin (0.1 μM) is first applied to block the adrenergic component of constriction. Circle indicates electrical stimulation and bars indicate period of antagonist application; traces without annotation are control responses. (c) Data are mean responses±s.e.mean (n=4 – 6 arteries from 3 – 5 animals) expressed as per cent of control.