LSAT 152 – Section 1 – Question 22

LSAT 152 - Section 1 - Question 22

November 2018

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Question QuickView	Type	Tags	Answer Choices	Curve	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT152 S1 Q22	+LR	Most strongly supported +MSS Causal Reasoning +CausR	A 4% 158 B 5% 156 C 26% 159 D 64% 163 E 1% 152	143 155 166	+Harder	148.23 +SubsectionMedium

Although severing a motor nerve kills part of the nerve, it can regenerate, growing about 1 millimeter per day from the point of damage toward the muscle the nerve controlled. So, for example, a severed motor nerve that controlled a hand muscle requires a much longer time to regenerate if that nerve is severed at the shoulder rather than at the wrist. Furthermore, the growing cells require the original nerve sheath to guide them to the area that has lost function, but that sheath begins to disintegrate after about three months unless there is living nerve tissue within it.

Summary

Severing a motor nerve kills part of the nerve. However, the nerve can regenerate. When regenerating, a nerve grows about 1 millimeter every day from the point of severing toward the muscle the nerve controlled. For example, a severed motor nerve controlling a hand would take longer to regenerate if the nerve was severed at the shoulder compared to the wrist. Growing nerve cells require the original nerve sheath to guide them to the muscle that lost function. However, the original nerve sheath disintegrates after three months unless living nerve tissue exists within it.

Strongly Supported Conclusions

If an original nerve sheath has living nerve tissue, then the likelihood a motor nerve can regenerate increases.

Doubling the speed at which new nerve cells grow will double the likelihood that a severed motor nerve will reach the muscle it had controlled.

This answer is unsupported. We don’t know if the speed at which nerve cells grow is directly proportional with the likelihood it will reach a muscle.

It is sometimes possible, once a nerve sheath has begun to disintegrate, to reverse or slow the process of disintegration.

This answer is unsupported. We don’t know whether it’s possible to reverse or slow the process of disintegration.

If a severed motor nerve does not regenerate successfully within three months after being severed, functioning cannot be restored to the muscle that the nerve had controlled.

This answer is unsupported. We don’t know if successful nerve regeneration within three months is necessary for a muscle’s function to be restored.

If living nerve tissue could be implanted and sustained within the original sheath of a severed motor nerve, the likelihood that the nerve will regenerate would increase in some cases.

This answer is strongly supported. The only exception to disintegration is if living nerve tissue still exists in the sheath. If living nerve tissue could be injected, then the likelihood of regeneration increases even if only slightly.

Without surgical intervention, a muscle that has lost function because of a severed motor nerve is unlikely to regain that function.

This answer is unsupported. We don’t know if surgical intervention is required to restore function to a muscle severed from a motor nerve.

LSAT 152 – Section 1 – Question 22

LSAT 152 - Section 1 - Question 22

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LSAT PrepTest 152 Explanations

Section 1 - Logical Reasoning

Section 2 - Logical Reasoning

Section 3 - Reading Comprehension

Section 4 - Logical Reasoning

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