140 



Claude A. Villee 



30 



20 



10 



.-v. t 



10 



20 



25 



30 



35 



40 



WEEKS OF PREGNANCY 



Fig. 7. The production of lactate by the placenta as a 



function of age. The values are expressed as /imoles per g. 



of Avet tissue per hour. The arrow at 40 weeks indicates 



the range of values for term placenta. 



made when no substrate was added. Since glucose is meta- 

 bolized to lactate via pyruvate, the greater production of 

 lactate from a glucose substrate than from pyruvate itself can 



Table III 



The Production of Lactate by Slices of Term Placentas 



