There is evidence that the usual variety of high blood pressure is, in part, a familial disease. Since families have similar genes as well as similar environment, familial diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of one environmental factor commonly shared by families, namely dietary salt, has been studied at Brook-haven National Laboratory. These studies suggest that chronic excessive salt ingestion can lead to high blood pressure in man and animals. Some individuals, however, and some rats consume large amounts of salt without developing high blood pressure. No matter how strictly all environmental factors were controlled in these experiments, some salt-fed animals never develop hypertension whereas a few rapidly developed very severe hypertensions followed by early death. These marked variations were interpreted to result from differences in genetic constitution.
By mating in successive ge
A. The experiments show that salt ingestion does not necessarily cause animals to develop hypertension with the environmental factors being equal.
B. Dietary salt is harmful to human being’s health.
C. Human beings’ high blood pressure will never be easily put under control.
D. In order not to develop hypertension, man should consume chemically pure salt.
There is evidence that the usual variety of high blood pressure is, in part, a familial disease. Since families have similar genes as well as similar environment, familial diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of one environmental factor commonly shared by families, namely dietary salt, has been studied at Brook-haven National Laboratory. These studies suggest that chronic excessive salt ingestion can lead to high blood pressure in man and animals. Some individuals, however, and some rats consume large amounts of salt without developing high blood pressure. No matter how strictly all environmental factors were controlled in these experiments, some salt-fed animals never develop hypertension whereas a few rapidly developed very severe hypertensions followed by early death. These marked variations were interpreted to result from differences in genetic constitution.
By mating in successive ge
A. genetic constitution or hereditary factor is an important factor that may underlie hypertension
B. excessive use of salt may cause high blood pressure
C. shared environmental factors may lead to familial disease
D. there are two different kinds of strains in animals which cause their different reactions to excess salt ingestion
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