52 SECRETION 



of the water and the salts, are excreted by the activity of the 

 epithelium of the renal tubules. 



QUESTIONS ON CHAPTER II 



What is the meaning of the term secretion? 



Distinguish between internal and external secretions. 



Give proofs that gland cells are active during secretion. Discuss. 



What physical processes are involved in secretion? 



What is the source of the saliva? 



Distinguish between albuminous and mucous secretions. 



Give, in detail, the mechanism of saliva secretion. 



What is meant by paralytic and antilytic secretions? 



What is the source of the gastric juice? 



Give, in detail, the mechanism of gastric secretion. 



What is the effect of the stimulation of nerves supplying the pancreas? 



Give, in detail, the mechanism of pancreatic secretion. 



What is secretin? Give its properties. 



What is enterokinase? 



Discuss the relation between the character of the secretion and the nature 

 of the food. 



Why does extirpation of the pancreas lead to profound metabolic dis- 

 turbances? 



What evidence is there that the pancreas yields an internal secretion? 



In what way are the islands of Langerhans involved? 



What are the functions of the liver? 



What are the results of the stimulation of nerves on bile secretion? 



What is the normal stimulus to bile secretion? 



Discuss the formation of urea by the liver. 



Discuss the storage of glycogen by the liver. 



Is the activity of intestinal glands under nervous control? 



What are serous secretions? Describe properties. 



Tell what you can of the lacrymal glands. 



What are the secretions of the skin? 



What is the composition of perspiration? How formed? What relation 

 to insensible perspiration? 



Discuss the sebaceous secretion. 



Where is milk formed? Describe milk. 



How does human milk differ from cow's milk? 



What histological changes occur during milk secretion? 



What are the symptoms of thyroid extirpation? 



How may these symptoms after extirpation be obviated? 



What is iodothyrin? 



What is the method of action of the thyroids? 



Discuss the function of the parathyroids. 



Describe the result of extirpation of the suprarenal capsules. 



Describe the result of intravenous injection of extracts of the supra- 

 renal capsules. 



Are different kinds of smooth muscle affected in the same way by supra- 

 renal extracts? 



What is the source of the adrenalin of the suprarenal capsules? 



How do the natural and the artificial adrenalin compare? 



What dose of adrenalin is necessary to produce a physiological effect? 



What is the effect of extirpation of the pituitary body? 



What are the symptoms of disease of the pituitary body? 



