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Damaged nerves in the spinal cord do not regenerate [#permalink]
04 Dec 2005, 21:07
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Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants. The reason, recently discovered, is the presence of nerve-growth inhibitors in the spinal cord. Antibodies that deactivate those inhibitors have now been developed. Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future.
Which of the following, if true, casts the most serious doubt on the accuracy of the prediction above?
(A) Prevention of the regeneration of damaged nerves is merely a by-product of the main function in the human body of the substances inhibiting nerve growth.
(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.
(C) Nerves in the brain are similar to nerves in the spinal cord in their ability to regenerate themselves naturally.
(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants.
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies.
I also got the answer correct by process of elimination.
Here is my reasoning.
Conclusion-Nerve repair will be standard medical procedure in the future
Evidence-because newly developed antibodies will deactivate inhibitors that block the spinal chord nerves from regenerating.
Assumption- blocking inhibitors will allow spinal chord nerves to regenerate
B-" certain" is too weak of an answer for weakening
Also, this is inconclusive. Antibodies deactivate the inhibitors. If some stimulants are similar in structure to the antibodies then, depending how many more stimulants there are than antibodies, there will be competition for the attachment to the inhibitors. If there are alot more antibodies than stimulants, then the arguement stays intact. If there are alot more stimulants than the antibodies, then most of the stimulants will attach to the inhibitors. thus, the antibodies can't deactivate the inhibitors.
D-OS, we talking about spinal chord nerves
A- It is possible that the inhibitors do other things in the human body. Lets say that it plays a part in breathing and needs to be activated. So if you deactivate the inhibitors, then something else goes wrong in another part. Therefore, this method might not be the best approach.