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.
What's the best approach to determine the answer? Can any experts help?
Target Test Prep 20% Off Flash Sale is on! Code: FLASH20
Redeem5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILSThis topic has expert replies
-
- Moderator
- Posts: 426
- Joined: Tue Aug 22, 2017 8:48 pm
- Followed by:1 members
A group of scientists studying calcium metabolism in laborat
by
BTGmoderatorAT » Wed Dec 20, 2017 10:15 pm
• Page 1 of 1
5/5
5 Star (473 Reviews)
"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."
"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."
"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."
GMAT Course Reviews
Admissions Consulting Reviews
FREE GMAT PREP RESOURCES
GMAT PREP DEAL TRACKER
- ONLY $85
- SAVE $300
- ONLY $99
- $150 OFF
- 50% OFF
- SAVE $75
- 100% OFF