The availability of these two strains permits investigations possible. They provide a plausible laboratory model on which to investigate some clinical aspects of the human hypertension. More important, there might be the possibility of developing methods by which genetic susceptibility of human beings to high blood pressure can be defined without waiting for its appearance. Radioactive sodium 22 was an important tool in working out the characteristics of the sodium chloride metabolism.
21. The study of the effects of salt on high blood pressure was carried out_______.
A. as members of the same family tend to use similar amounts of salt
B. to explore the long-term use of a sodium based substance
C. because it was proven that salt caused high blood pressure
D. because of the availability of chemically pure salt and its derivatives
22. The main difference between S and R rats is their_______.
A. need for sodium 22 B. rate of mating
C. reaction to salt D. type of blood
23. We can infer from the article that sodium 22 can be used to_______.
A. control high blood pressure
B. cure high blood pressure caused by salt
C. tell the S rats from the R rats
D. determine what a sodium chloride metabolism is like
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