文档介绍：There is evidence that the usual variety of high blood pressure is, in part, a familiar disease. Since families have similar genes as well as similar environments,familiar diseases could be due to shared ic influences,to shared environmental factors,or to some years,the role of one environmental monly shared by families,namely dietary salt(.,sodium chloride),has been studied at Brookhaven National studies suggest that chromic excess salt ingestion can lead to high blood pressure in man and individuals,however,and some rats consume large amounts of salt without developing high blood matter how strictly all environmental factors were controlled in these experiments,some salt-fed animals never developed hypertension whereas a few rapidly developed very severe hypertension followed by early marked variations were interpreted to result from differences in ic constitution.
 
By mating is essive generations only those animals that failed to develop hypertension from salt ingestion,a resistant strain(the "R" Strain)has been evolved in which consumption of large quantities of salt fails to influence the blood pressure contrast,by mating only animals that quickly develop hypertension from salt,a sensitive strain("S" strain)has also been developed.
 
The availability of these tow strains permits investgations not heretofore provide a plausible laboratory model on which to investigate some clinical aspects of the human prototypes of important,there might be the possibility of developing methods by which ic susceptibility of human beings to high blood pressure can be defined without waiting for its sodium 22 was an important "tool" in working out the characteristics of the sodium chloride metabolism.
 
study of the effects of salt on high blood pressure was carried out ______.
members of the same family tend to use similar a