416 FOODS CIRCULATED AND USED IN THE BODY 



Colds are, in reality, a congestion of membranes lining certain 



parts of the body, as the nose, throat, windpipe, or lungs, together 



r ,. _. „ . . with a growth of bacteria 



l ,;,^^.^ ,:;„:.^,;,^, ^,::^^ .; ' ;, : which were present in the* 

 ■ga? @ 9 % <L @ © @ @^ *9y-» mouth or throat. Some colds 



^ @ \^K& are commuincaD l e an( i gain 



=^«^^^© # f/^ entrance to the body when 



^-^TT^fc -. ; the resistance is low. 



J @ © @ © @ © f ®j®®£ fS*" When SUfferln S fr0m a C0ld -" 



™' "'"" " " it is therefore important not 



_____ to chill the skin, as a full 



§|l%8yfiv blood supply should be kept 



j*$W. m in it and thus kept from the 



'jfp^ seat of the congestion. For 



£ this reason hot baths (which 



:vn©^|®rtlle brin & tne blood to the skin), 

 ^^^^^ the avoiding of drafts (which 

 chill the skin), and warm 



Explain this diagram. What has happened in lxl _. r i r j. 



the lower figure? clothing are useful factors m 



the care of colds. Very im- 

 portant also are rest in bed, fresh air, plenty of water to drink, 

 and free bowel movements. 



Practical Exercise 9. What is a congestion and how is it caused ? How do 

 we " take cold "? Is there more than one kind of cold? 



Self-Testing Exercise 



Body temperature is regulated by action of nerves in the (1). 



They either cause the small blood vessels to (2) or (3), 



thus placing more or less (4) at the (5) of the body 



where the (6) heat may be (7) by perspiration. The 



kidneys are organs of (8) (9) waste is passed out 



as (10). An oversupply of (11) food may make too 



much work for the kidneys. 



Review Summary 



Test your knowledge of the unit by: (1) rechecking the summary ques- 

 tions ; (2) performing all the assigned exercises ; (3) checking with the teacher 

 on all tests and trying over the parts you missed ; (4) and finally making an 

 outline of the unit for your notebook. 



