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# A group of scientists studying calcium metabolism in

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Joined: 04 May 2006
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Schools: CBS, Kellogg
A group of scientists studying calcium metabolism in [#permalink]

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19 May 2009, 00:09
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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.
[Reveal] Spoiler: OA

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Last edited by ankurgupta03 on 01 Jun 2014, 12:13, edited 1 time in total.
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19 May 2009, 02:27
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Clearly A
remove Parathyroid -->decrease level of calcium
both remove Parathyroid & Adrenal --> decrease but less than before
--> remove Adrenal -->increase level of calcium
--> not remove Adrenal (remains in rat's body) --> decrease level of calcium

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 --> best
(B) The adrenal gland and the parathyroid gland play the same role in regulating calcium blood levels -->no, they play opposite roles
(C) The absence of a parathyroid gland causes the adrenal gland to increase the level of calcium in the blood -->counter
(D) If the adrenal gland, and no other gland, of a rat were removed, the rat’s calcium level would remain stable -->of course not
(E) The only function of the parathyroid gland is to regulate the level of calcium in the blood -->this is impressive, however, only seems too strong, and this is not the surprising discovery of the scientist about rats
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19 May 2009, 02:19
A and D. do not support the surprising discovery.
C. does not support initial discovery.
E. neutral to the surprising discovery.

Hence, B should be the answer.
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19 May 2009, 04:17
i too agree with A as the answer..
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20 May 2009, 14:37
imo , C

A ---> too general
B --> if they play same role the level should have dropped even more quickly
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21 May 2009, 00:46
OA is A
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21 May 2009, 06:03
Excellent explanation. It took me lot of time to understand why it's A!

Minheequang wrote:
Clearly A
remove Parathyroid -->decrease level of calcium
both remove Parathyroid & Adrenal --> decrease but less than before
--> remove Adrenal -->increase level of calcium
--> not remove Adrenal (remains in rat's body) --> decrease level of calcium

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 --> best
(B) The adrenal gland and the parathyroid gland play the same role in regulating calcium blood levels -->no, they play opposite roles
(C) The absence of a parathyroid gland causes the adrenal gland to increase the level of calcium in the blood -->counter
(D) If the adrenal gland, and no other gland, of a rat were removed, the rat’s calcium level would remain stable -->of course not
(E) The only function of the parathyroid gland is to regulate the level of calcium in the blood -->this is impressive, however, only seems too strong, and this is not the surprising discovery of the scientist about rats
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21 May 2009, 11:35
I'll vote for A....
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22 May 2009, 06:55
I took a second look and i understand now why its A. It was a good question though. +1 for the poster and +1 for answerer.
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08 Jun 2009, 05:24
I'm for A too.
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05 Aug 2011, 00:40
Minheequang wrote:
Clearly A
remove Parathyroid -->decrease level of calcium
both remove Parathyroid & Adrenal --> decrease but less than before
--> remove Adrenal -->increase level of calcium
--> not remove Adrenal (remains in rat's body) --> decrease level of calcium

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 --> best
(B) The adrenal gland and the parathyroid gland play the same role in regulating calcium blood levels -->no, they play opposite roles
(C) The absence of a parathyroid gland causes the adrenal gland to increase the level of calcium in the blood -->counter
(D) If the adrenal gland, and no other gland, of a rat were removed, the rat’s calcium level would remain stable -->of course not
(E) The only function of the parathyroid gland is to regulate the level of calcium in the blood -->this is impressive, however, only seems too strong, and this is not the surprising discovery of the scientist about rats

decreased much less sharply = less decrease. You're awesome. +1
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Re: A group of scientists studying calcium metabolism in [#permalink]

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01 Jun 2014, 03:59
We can take this question as cause and effect question :

removal of Parathyroid --> level of calcium decreases (either bcoz of absence of parathyroid or something else leads to the decrease)
since , its given parathyroid controls the calcium level that means something else decreasing the ca level.
both remove Parathyroid & Adrenal --> decrease in calcium gets slower ---> It means Adrenal was responsible for the decrease in the ca levels.
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Re: A group of scientists studying calcium metabolism in [#permalink]

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07 Dec 2015, 12:13
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A group of scientists studying calcium metabolism in   [#permalink] 07 Dec 2015, 12:13
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