Apologia Anatomy and Physiology mod 5 the muscular system

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What is a sarcomere?

sarcomere: the repeating unit of a myofibril

What is a motor unit?

motor unit: One motor neuron and all the muscle fibers it innervates.

What is the all or nothing law of muscle contraction?

a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus.

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