308 SECRETION 



secretion of this gland will cause an increase in the 

 force of the heart-beat and a rise in blood-pressure 

 by stimulating the arterioles. According to Ho well, 

 the extract given intravenously from the posterior lobe 

 will cause a rise in blood-pressure and slow the heart- 

 beat, the extract from the anterior lobe being negative 

 as to its effect on the circulatory and respiratory 

 organs. Disease of the pituitary body will give rise 

 to the condition of acromegalia, in which there is a 

 marked enlargement of the bones of the face and 

 extremities. When diseased in early life it is respon- 

 sible for the progressive changes, characterized by 

 extreme growth of the body, termed gigantism; also 

 a marked increase of fatty tissue. 



Carotid Glands. The carotid glands or bodies are 

 small reddish-brown bodies, oval in shape, their long 

 diameter measuring i of an inch. They are found in 

 the cervical region, at the bifurcation of the common 

 carotid artery into the internal and external carotid 

 trunks. 



Coccygeal Gland. The coccygeal gland or body, 

 or Luschka's gland, is as large as a millet-seed, found 

 at the tip of the coccyx. It is connected with middle 

 sacral artery. 



QUESTIONS 



1. Give the difference between an external and internal secretion. 



2. Name some of the external secretions. 



3. How are secretions utilized by the tissues of the body? 



4. Name the secreting membranes of the body. 



5. Name the organs of internal secretion. 



6. Give the general arrangement of the structures seen in a 

 secretory gland. 



7. By what structure does a secreting gland communicate with 

 a membrane upon which its secretion is poured out? 



8. What part does the nerve system play in regard to gland 

 secretion? 



9. What is excretion? 



10. Describe the structure of a mammary gland. 



11. Is human milk alkaline or acid in reaction? 



12. Docs milk contain oil globules? 



