76 



Chapter VI 



(1) During the contraction. The adequacy of the oxygen supply 

 depends upon the rate of blood flow in the muscle and this in turn 

 depends upon the pressure in the blood vessels. 



(2) After the contraction. The response to the call is in every 

 case at its maximal value after the tetanus passes off, which shows 

 that the call for oxygen continues for some time after the actual 

 work is performed which the oxidation is designed to meet. 



fIC. 2 



500 sec 



FIG. 40. Oxygen used by gastrocnemius muscle. Ordinate = c.c. per gram. Abscissa = 

 seconds. The dotted vertical lines signify points at which the kymograph was stopped. 



Total 



oxygen 



capacity of Wt. of 

 1 c.c. blood muscle 



(c.c. Oo) gin. 



175 



28 '6 



121 19-7 



179 16-5 



