AFAA Personal Trainer Certification Practice Exam

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Study for the AFAA Personal Trainer Certification Exam. Engage with quizzes, flashcards, and multiple-choice questions. Prepare efficiently with hints and explanations to achieve certification success.

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What is a motor unit?

A large group of muscle fibers
A single motor neuron and all the muscle fibers it controls
Any nerve that interacts with muscle tissues
A combination of different types of muscle fibers

The correct answer is: A single motor neuron and all the muscle fibers it controls

A motor unit is defined as a single motor neuron and all the muscle fibers it controls. This is a fundamental concept in exercise physiology and muscle function. The motor neuron transmits signals from the central nervous system to the muscle fibers, causing them to contract. Each motor neuron can innervate multiple muscle fibers, but all those fibers are of the same type. The size of the motor unit can vary; smaller motor units control a few muscle fibers and are typically involved in fine motor skills, while larger motor units control many fibers, suitable for more powerful movements. Understanding motor units is crucial for personal trainers as it helps them grasp how different types of exercise influence muscle contractions and overall strength development.