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A group of scientists studying calcium metabolism in

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A group of scientists studying calcium metabolism in [#permalink] New post 02 Apr 2005, 00:45
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A
B
C
D
E

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A group of scientists studying calcium metabolism in laboratory rats discovered that removing the rats’ parathyroid glands resulted in the rats’ having substantially lower than normal levels of calcium in their blood. This discovery led the scientists to hypothesize that the function of the parathyroid gland is to regulate the level of calcium in the blood by raising that level when it falls below the normal range. In a further experiment, the scientists removed not only the parathyroid gland but also the adrenal gland from rats. They made the surprising discovery that the level of calcium in the rats’ blood decreased much less sharply than when the parathyroid gland alone was removed.
Which one of the following, if true, explains the surprising discovery in a way most consistent with the scientists’ hypothesis?
(A) The adrenal gland acts to lower the level of calcium in the blood.
(B) The adrenal gland and the parathyroid gland play the same role in regulating calcium blood levels.
(C) The absence of a parathyroid gland causes the adrenal gland to increase the level of calcium in the blood.
(D) If the adrenal gland, and no other gland, of a rat were removed, the rat’s calcium level would remain stable.
(E) The only function of the parathyroid gland is to regulate the level of calcium in the blood.
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 [#permalink] New post 02 Apr 2005, 03:43
C.

Choices A,B and E can be eliminated altogether. Choice D does not help us determine the function of the adrenal gland in the absence of the parathyroid gland.
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 [#permalink] New post 02 Apr 2005, 03:49
On a Second thought .....A it is.

When only parathyroid gland is removed -- calcium levels fall faster

when both parathyroid and adrenal glands are removed -- calcium levels fall slower

therefore adrenal gland is responsible in lowering the calcium levels.
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Re: CR [#permalink] New post 02 Apr 2005, 04:17
karun_aggarwal wrote:
A group of scientists studying calcium metabolism in laboratory rats discovered that removing the rats’ parathyroid glands resulted in the rats’ having substantially lower than normal levels of calcium in their blood. This discovery led the scientists to hypothesize that the function of the parathyroid gland is to regulate the level of calcium in the blood by raising that level when it falls below the normal range. In a further experiment, the scientists removed not only the parathyroid gland but also the adrenal gland from rats. They made the surprising discovery that the level of calcium in the rats’ blood decreased much less sharply than when the parathyroid gland alone was removed.
Which one of the following, if true, explains the surprising discovery in a way most consistent with the scientists’ hypothesis?
(A) The adrenal gland acts to lower the level of calcium in the blood.
(B) The adrenal gland and the parathyroid gland play the same role in regulating calcium blood levels.
(C) The absence of a parathyroid gland causes the adrenal gland to increase the level of calcium in the blood.
(D) If the adrenal gland, and no other gland, of a rat were removed, the rat’s calcium level would remain stable.
(E) The only function of the parathyroid gland is to regulate the level of calcium in the blood.


Go for A.

if only the parathyroid gland was removed, the calcium decreased more.
On the contrary, if both the parathyroid gland and the adrenal gland were removed, the calcium decreased less.

This proved that the adrenal gland acts to lower the level of calcium in the blood.
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 [#permalink] New post 03 Apr 2005, 01:28
OA IS A
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  [#permalink] 03 Apr 2005, 01:28
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