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ISSA - Bodybuilding - Unit 1 Exam 2025 Questions and Answers Muscle - ....ANSWER ...-A group of motor units physically separated by a membrane from other groups of motor units. Smooth Muscle - ....ANSWER ...-Governed by the autonomic nervous system and includes the muscles that line the digestive tract and protect the blood vessels. Cardiac Muscle - ....ANSWER ...-Which includes the heart, as smooth muscle is modulated by the autonomic nervous system. Skeletal Muscle - ....ANSWER ...-Blends into tendinous insertions that attach to bones, pulling on them, which generates desired movement. Motor Unit - ....ANSWER ...-Consists of a single neuron and all the muscle fibers innervated by it. Myofibrils - ....ANSWER ...-Microscopic protein filaments that make up muscle cells. Small bundles of myofilaments. Myofilaments - ....ANSWER ...-The contractile proteins, actin and myosin, of muscle cells …FOR STUDENTS ONLY…©️2025 ALL RIGHTS RESERVED… 1