SECTION II B. 

 CHAPTER VII. 



HAEMODYNAMICS 



Although many fundamental facts relating to the function of 

 the cardiovascular system can be learned from experiments on 

 cold-blooded animals, it is essential for a proper understanding of 

 the physiology of the circulation in man that a certain number of 

 experiments be performed by the student on mammals. In order 

 that this may be done without causing any pain, the animal must 

 be deeply anaesthetised by an expert assistant before starting the 

 experiment, the anaesthesia must be maintained throughout, and 

 when the experiment is finished, the animal must be painlessly 

 killed.* 



The following two experiments are selected to illustrate certain 

 fundamental factors governing the circulation of the blood. Other 

 fundamental experiments will be demonstrated before the class. 



Each experiment is performed by a group containing from four 

 to six students. Two of these act as operators and are responsible 

 for the operative manipulations, one or two attend to the apparatus 

 (technicians), and the remainder make detailed notes of every 

 step in the experiment. After the experiment is completed, the 

 group should review the results and each member of it prepare a 

 report, embodying copies of the tracings secured. These reports 

 are to be handed in for inspection.! 



*For small classes it is practicable to have these essential mammalian 

 experiments done on decerebrated preparations (see p. 247), but this is impossible 

 when large numbers have to be provided for. 



fFor the experiments each student must provide himself with the following 

 instruments: dissecting case, including 1 pair scissors and a blunt hook (aneurism 

 needle or strabismus hook) ; 2 pairs, haemostats (Pean or Spencer Wells forceps) ; 

 2 pairs, bull dog forceps; a stethoscope. 



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