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Who is credited with first characterizing America as an exceptionally mobile society where children born in poverty do not remain trapped there?
Motor Units
Refers to the combination of a motor neuron and the skeletal muscle fibers innervated by that motor neuron's axonal terminals.
Muscle Fibers
Long, slender cells that make up muscles, capable of contracting to produce movement in parts of the body.
Trained Muscle
Muscle that has undergone physiological changes due to exercise, enhancing its strength, endurance, or size.
Anaerobic Respiration
A form of respiration using electron acceptors other than oxygen, often occurring in muscle cells during intense exercise when oxygen is scarce.
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