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Black Americans are, on the whole, about twice as likely as

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Director
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Black Americans are, on the whole, about twice as likely as [#permalink] New post 14 Sep 2005, 16:48
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A
B
C
D
E

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Black Americans are, on the whole, about twice as likely as White Americans to develop high blood pressure. This likelihood also holds for westernized Black Africans when compared to White Africans.
Researchers have hypothesized that this predisposition in westernized Blacks may reflect an interaction between western high-salt diets and genes that adapted to an environmental scarcity of salt.

Which of the following statements about present-day, westernized Black Africans, if true, would most tend to confirm the researchers’ hypothesis?

(A) The blood pressures of those descended from peoples situated throughout their history in Senegal and Gambia, where salt was always available, are low.
(B) The unusually high salt consumption in certain areas of Africa represents a serious health problem.
(C) Because of their blood pressure levels, most White Africans have markedly decreased their salt consumption.
(D) Blood pressures are low among the Yoruba, who, throughout their history, have been situated far inland from sources of sea salt and far south of Saharan salt mines.
(E) No significant differences in salt metabolism have been found between those people who have had salt available throughout their history and those who have not.
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Re: CR - Blood pressure [#permalink] New post 14 Sep 2005, 17:23
A.... only this AC shows the reltionship, higher the level of salt, higher the incidence of having high blood pressure and vice versa, of salt with blood pressure.
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 [#permalink] New post 14 Sep 2005, 23:01
I dont really understand this one...
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 [#permalink] New post 14 Sep 2005, 23:12
Westernized black americans
-> have genes adapted to an environmental scarcity of salt
-> western high-salt diets
-> high blood pressure

If the above is true, the following seems also to be true:

Westernized black americans
-> have genes adapted to an environment where salt was always available
-> western high-salt diets
-> no problem

Thus (A) is the best answer.
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 [#permalink] New post 15 Sep 2005, 02:01
A should be the answer

As gamjatang explains, if salt was available their genes would have
been adapted to the salt level and when westernised, they wouldn't have
any problem.
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 [#permalink] New post 15 Sep 2005, 06:35
"A" is the best answer
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 [#permalink] New post 15 Sep 2005, 20:44
A for me too!
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 [#permalink] New post 16 Sep 2005, 04:12
I found this one really tough! Nice ways to interpret guys!

OA is A indeed!
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  [#permalink] 16 Sep 2005, 04:12
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