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Every muscle needs one molecule to keep contracting. That molecule is:

AATP
BAPR
CABS
DAMU
Answer & Solution
Correct answer: A. ATP
1. Contraction costs energy. 2. One molecule is the universal energy currency. 3. That molecule is ATP. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._
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