196 ANATOMY AND PHYSIOLOGY FOR NURSES 



phalanges of the fingers and toes. The nail has a firm 

 attachment to the cutis, and the part beneath the body 

 and root is called the matrix, from which successive growth 



FIG. 101. Human hair: I, The hair of a child; 2, hair of an adult; 3, 

 pointed extremity of the hair of the eyebrow ; a, transverse section of the 

 hair, showing the cortical and medullary portions, and air-cells in the center 

 of the cylinder (Chapman). 



of the nail is produced, with the accumulation of the cells 

 therein. 



The chemic composition of the nails is the same as that 

 of the epidermis, with a larger proportion of sulphur and 

 carbon. 



REVIEW QUESTIONS 



What do you understand by metabolism? 

 What is known by elimination? 

 What are the waste products.? 

 What constitutes the excretory system? 

 How many kidneys are there? 

 What is the function of the kidneys? 

 Give the location of the kidneys. 

 What is their average weight? 

 What are the Malpighlan bodies? 

 Describe the structure of the kidneys. 

 Describe the uriniferous tubules. 

 Describe the ureters. 



