| Description | Slide showing a black and white graph which demonstrates 'the effect upon pulmonary pressure, aortic pressure, respiration of a first dose representing 5 mg. of dry posterior lobe of ox-pituitary extracted with Ringer's solution.'
The scale of the chart starts at 60mm up to 250mm. There are 3 tracings on the graph, labelled 'p', 'a', and 'r'.
Title under image reads: 'Fig. 117 - Tracing showing the effect upon pulmonary pressure, aortic pressure, respiration of a first dose representing 5 mg. of dry posterior lobe of ox-pituitary extracted with Ringer's solution, not previously extracted with alcohol (cat, anaesthetised with chloralose.) Notice the well-marked fall of aortic pressure (due to the histamine-like depressor constituent) which preceeds the rise (caused by the pressor autacoid). In the pulmonary artery a rise of pressure is seen to accompany the fall in the aortic system. During the rise in the latter, the pulmonary pressure shows a slight fall. The respirations are rended somewhat irregular, but the effect is small.'
The key is as follows:
''p', pulmonary pressure (water manometer) ; 'a', aortic pressure (mercury manometer) ; 'r', respirations ; 's', signal of injection ; 't', time in ten second intervals. [The same lettering is used for Figs. 118 to 121]. The scales of pressure shown in this figure - the upper mm. of water for the pulmonary pressure, the lower mm. of mercury for the aortic - apply also to the tracings in Figs. 118 and 119.' |