Which of the following functions does the myelin sheath perform for a nerve cell?
Insulation
Regeneration
Sensory perception
Nutrition
The Correct Answer is A
The myelin sheath is a protective membrane that wraps around parts of certain nerve cells.
Its fatty-protein coating provides protective insulation for your nerve cell like the plastic insulation covering that encases the wires of an electrical cord ².
This allows the electrical impulses to travel quickly and efficiently between one nerve cell and the next ². The other options are not correct because they do not describe the functions of the myelin sheath.
Regeneration, sensory perception, and nutrition are not functions performed by the myelin sheath for a nerve cell.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The statement that best supports the grant proposal is a. Repeating the published work will provide independent confirmation of the results. Independent confirmation of results is an important part of the scientific process. By repeating an experiment that was recently published by another researcher, the researcher writing the grant proposal can provide additional evidence to support or refute the original findings.
B. Repeating published work with changed variables will extend the previous results, but this is not the main goal of repeating an experiment.
C. Funding this important research will benefit science in the long term is a general statement that does not specifically support the grant proposal to repeat an experiment.
D. Funding this grant proposal will allow this laboratory to continue to study this topic is also a general statement that does not specifically support the grant proposal to repeat an experiment.
Correct Answer is C
Explanation
The correct answer is c. 100,000. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A pH 4 solution has a hydrogen-ion concentration that is 10^5 (or 100,000) times greater than that of a pH 9 solution.
A. 0.00001 is the hydrogen-ion concentration of a pH 9 solution as compared with a pH 4 solution.
B. 5 is the difference in pH units between a pH 4 solution and a pH 9 solution.
D. 50 is not the correct answer.
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