Description: Segment 1 The lecturer shows animated diagrams of the pathways of the autonomic nervous system, describing its general function and showing how it is divided into two parts - the parasympathetic and the sympathetic. He points out the differences between the two parts and differentiates their roles in the mechanisms of the body. A film is shown in which the effect of drugs on the nervous system of an anaesthetised cat is explained. The film goes through the process of cannulating the cat and details are given as to how the nervous system will be measured throughout the experiment. Time start: 00:00:00:00 Time end: 00:06:00:00 Length: 00:06:00:00 Segment 2 Electrodes are attached to nerve endings in the cat, then an animated diagram is used to explain the effects of stimulation on the sympathetic nerves following injections of noradrenaline and adrenaline. We then return to the film of the anaesthetised cat and the effects of injecting noradrenaline and adrenaline are shown. An animated diagram showing the function of alpha-and beta-receptors at the sympathetic nerve endings is shown. Time start: 00:06:00:00 Time end: 00:12:06:00 Length: 00:06:06:00 Segment 3 Animated diagrams detail what happens when the parasympathetic nerves are stimulated. We return to the film of the anaesthetised cat and see the effects of stimulation on the parasympathetic nerves. Alpha- and beta-receptors are blocked experimentally with drugs and the effects of this is shown on the cat. Time start: 00:12:06:00 Time end: 00:17:19:00 Length: 00:05:13:00 Segment 4 Other alpha- and beta-receptor drugs are experimented with on the anaesthetised cat and the various drugs are described and listed. The lecture is summarised while a final animated diagram is shown. This details how transmission in the autonomic nervous system can be blocked at various siges and how different drugs can elicit this. Time start: 00:17:19:00 Time end: 00:20:56:16 Length: 00:03:37:16