46 



SOURCES OF KINETIC AND METABOLIC HORMONES 



in response to nervous stimulation, but always depend upon a 

 direct stimulus, either mechanical or chemical (§ 4.321). 



The positions from which the various hormones have been 

 found to be secreted in the gut are summarized in Table 5. . 



Table 5. Endodermal sources of kinetic and metabolic 

 hormones in vertebrata 



* K = kinetic. 



M = metaboHc. 



2.22 ENDODERMAL ENDOCRINE GLANDS 



Recognizable endocrine gland cells are derived from the gut 

 epithelium in two regions: the pharynx, where there are at least 



