Each skeletal muscle fiber has many bundles of myofilaments. Each bundle is called a myofibril. This is what gives the muscle its striated appearance. The contractile units of the cells are called sarcomeres.

Each skeletal muscle fiber has many bundles of myofilaments. Each bundle is called a myofibril. This is what gives the muscle its striated appearance. The contractile units of the cells are called sarcomeres. - 56719800

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