Reading ComprehensionDifficulty: Hard

PT147 S2 P1 Q5 Explanation

Muscle Memory

A free, expert breakdown of this official LSAT Reading Comprehension question.

TopicsInferenceScience

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Passage

Passage A Muscle memory is a puzzling phenomenon. Most bodybuilders have experienced this phenomenon, yet virtually no discussions of it have appeared in scientific publications. Bodybuilders who start training again after a period of inactivity find that gaining muscle size seems easier the second time around—even if athletes observing muscle memory, some plausible explanation must exist.

One potential explanation of muscle memory involves the neurons (nerve cells) that stimulate your muscles, telling the muscle fibers to contract. It is well established that during weight lifting, only a small percentage of neurons for the working muscles are recruited. The more weight you lift, the more neurons are involved and you may think you’re starting from the same place, this greater strength would enable faster progress.

Then again, it’s also possible that the ease of retraining has nothing to do with your muscles: it could all be in your head. The first time you trained, you didn’t know how much you could lift. So you increased weight cautiously. When retraining, you already know you can handle increasing weight These more rapid weight increases produce quicker gains in strength and size.

Passage B Pumping up is easier for people who have been buff before, and now scientists think they know why— muscles retain one aspect of their wither from lack of use.

Because muscle cells are huge, more than one nucleus is needed for making the large amounts of the proteins that give muscles their strength. Previous research has demonstrated that with exercise, muscle cells get even bigger by merging with stem cells that are nested between them. The muscle cells incorporate the nuclei extra cell nuclei are killed by a cell death program called apoptosis.

In a recent study, researchers regularly stimulated the leg muscles of mice over a two-week period, during which time the muscle cells gained nuclei and increased in size. The researchers then let the muscles rest. As the muscles atrophied, the cells deflated to about 40 percent of their bulked-up size, but the muscle proteins again, providing a type of muscle memory at the cellular level.

What this question is testing

Inference

Your task

Find what must be true based on what the passage or stimulus states.

Common trap

Answers that are plausible or likely but not actually guaranteed by the text.

Winning move

Keep only the choice the statements fully support — eliminate anything that requires an extra assumption.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
5.

Given the style and tone of each passage, which one of the following is most likely to correctly describe the expected

Answer choices

  1. Fails A6% picked this

    Passage A: skeptics of the phenomenon

    Passage B: people with personal experience of the phenomenon

    If passage A were written for people skeptical that muscle memory existed, it would spend more of its time convincing the audience it exists. The majority of passage A is taking for granted that the phenomenon exists and just speculating what the possible cause of it would be. There's no reason to keep reading beyond that, but there's no great support that passage B is written for people with personal experience of muscle memory (i.e. bodybuilders).

  2. Opposite, if anything6% picked this

    Passage A: scientific

    Passage B: athletic trainers and

    There's not really strong textual support to say the tone of either one better matches researchers vs. trainers / coaches. In terms of content, passage B, not A, is definitely the more hard-science passage, so passage B would skew toward science researchers. And since passage A contains a psychological explanation for muscle memory, it would be of more interest to athletic trainers / coaches.

  3. Unsupported Relationship: trainer vs. self-train2% picked this

    Passage A: athletes who work with

    Passage B: people who pursue a fitness program on

    Nothing in these passages would allow us to draw a distinction based on whether the reader works with a trainer or trains by themselves. Passage A talks about "the first time you trained ... you increased weight cautiously". That sounds more like training on their own, so if anything this answer is reversed.

  4. Correct61% picked this

    Passage A:

    Passage B: a general

    Why this is right

    As my anticipation reveals, I wouldn't have been predicting this sort of split. It felt like both passages could equally be read by bodybuilders or a general audience. However, if we scan (desperately, because we hate all the other answers), looking for support, we see that the last paragraph is using the 2nd person pronoun "you" and speaking as though its audience will remember having trained before. The annoying thing about that is the 2nd person pronoun starts in the 2nd paragraph, in a very scientific, general-audience kind of way: It is well established that during weight lifting, only a small percentage of neurons are recruited. The more weight you lift, the more neurons involved. The 2nd person pronoun usage continues then for the rest of Passage A, so it sounds like it's just using "you" in the royal you sense. (Like when you're saying to someone, "You shouldn't flake on your friends. I don't mean you you. I mean anyone.") But LSAC must be leaning on this 3rd paragraph of passage A to support this answer. It just sounds like the author is commiserating with her audience; "Y'all remember how it was the first time we got jacked, right?" Meanwhile, passage B doesn't have any specific parts that make it seem like it's aimed at a general audience. A general audience is just the default audience, if it doesn't otherwise sound too technical or too insular.

    Skill tested: Inference · how this choice captures the passage's function is the move to repeat next time.

  5. Unsupported: sports vs. exercise25% picked this

    Passage A: sports

    Passage B: exercise

    There's nothing in the tone or content of either passage that skews towards sports vs. exercise, or vice-versa. Both passages seem to be aimed at exercise, i.e. body building / weightlifting.

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