PrepTest 147, Section 2, Question 3
Passage A Muscle memory is a puzzling phenomenon.(487 more words not shown)
Passage A(295 more words not shown)
Passage B(200 more words not shown)
Passage B, unlike passage A,(11 more words not shown)
- Amuscle cells' ability(5 more words not shown)
- Bthe body's ability(5 more words not shown)
- Cpsychological(1 more words not shown)
- Da cell death(4 more words not shown)
- Ethe neurons that(2 more words not shown)
Reading the passage
Keep the mechanisms straight. A discusses recruiting muscle fibers through nerve cells, then confidence about lifting heavier weights. B discusses muscle cells acquiring extra nuclei and retaining them after shrinking. We need the explanation specific to B.
Working the answers
- ACorrect
B says muscle cells merge with stem cells and incorporate their nuclei. The experiment then shows those extra nuclei remaining as the muscle cells shrink. The merger supplies the extra nuclei that make B's proposed explanation possible; A does not discuss it.
- B
This is too broad to distinguish them. A explicitly suggests that consistent training may improve muscle-fiber recruitment. That is also the body adapting to training.
- C
Psychological factors are A's second possibility, not B's proposed mechanism.
- D
B's explanation depends on the extra nuclei not dying. Researchers had expected apoptosis to remove them, but the experiment found that their number stayed the same. Naming a process mentioned in B does not make it the cause B proposes.
- E
Neurons belong to A's first explanation. Don't confuse those nerve cells with the nuclei inside muscle cells that B discusses.
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