104 FACTORS AFFECTING CILIARY ACTIVITY 



(ii) Sodium fluoride, which inhibits the activity of cilia of 

 oyster gills (Usuki, 1956a) and reduces the respiration and 



Glycogen 



Glucose-1 -phosphate 



requires Mg"*""*" \l 2 



Glucose-6-phosphate 



Fructose-6-phosphate 



phosphate from ATP >'\\ ^ 



Fructose-1, 6-diphosphate 



]\ 



dihydroxyacetone phosphate + Glyceraldehyde-3-phosphate 



\\ Me 



Glyceraldehyde-3-phosphate 

 2H to Co I-< ^^ 



phosphate from H3PO4— >*^^^ U 7 



1, 3-diphosphoglyceric acid 



phosphate to ADP-< J V 8 



3-phosphoglyceric acid 



W. .' 



2-phosphoglyceric acid 



requires Mg++ ir 10 



Enol phosphopyruvic acid 



requires Mg'*"+ 



phosphate to ADP-< > 



Eno 



il. 



11 



pyruvic acid 



12 



Keto pyruvic acid ^Tricarboxyhc acid cycle 



2H from Co I >^ 1^ 13 



Lactic acid 



Fig. 26. The breakdown of glycogen in glycolysis to provide 



pyruvic acid for the tricarboxylic acid cycle (Fig. 27). Reference 



is made in the text to the stages in this sequence of reactions 



by the numbers given in this figure. 



activity of sperm (Mann, 1954), blocks stage 10 so that an 

 accumulation of 3-phosphoglyceric acid occurs in oyster gill 



