In prolonged space flight, besides the obvious hazards of meteors, rocky debris, and...
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In prolonged space flight, besides the obvious hazards of meteors, rocky debris, and radiation, astronauts will have to deal with muscle atrophy brought on by weightlessness; therefore, when they return to Earth, they face a protracted period of weight training to rebuild their strength.
The word atrophy, as used in the paragraph, most nearly means:
Show answer & explanation
In a biological context, 'atrophy' refers to the degeneration or reduction in size of an organ or tissue, typically due to lack of use. 'Wasting' is the precise medical and linguistic synonym for this process of tissue loss.
Step-by-step Derivation:
Step 1: Analyze the context. The sentence discusses 'muscle atrophy brought on by weightlessness' and the subsequent need for 'weight training to rebuild their strength.'
Step 2: Evaluate the options based on the biological process of muscle loss in zero gravity.
- Option A (pain): While atrophy can be associated with discomfort, atrophy itself is a structural change, not a sensation of pain.
- Option B (wasting): In medical terminology, muscle wasting is the clinical synonym for atrophy (the loss of muscle mass).
- Option C (weakening): While atrophy leads to weakness, 'weakening' describes the loss of function/strength, whereas 'atrophy' specifically describes the loss of physical mass/tissue.
- Option D (cramping): Cramping is a sudden involuntary contraction, which is a different physiological phenomenon than the gradual degradation of tissue.
Step 3: Conclusion. 'Wasting' most accurately captures the morphological change (reduction in size/mass) implied by 'atrophy'.