Which of the following nucleic acids contain the pyrimidine ring structure? 
Definitions:
Motor Units
A single motor neuron and all the muscle fibers it innervates, functioning as a single unit.
Sarcomere
The basic structural and functional unit of muscle fiber, responsible for muscle contraction.
Peak Contraction
The moment during a muscle exercise when the muscle is fully contracted, offering maximum tension.
H Zone
A region within the sarcomere of striated muscle fibers that becomes narrower during muscle contraction.
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