The long, cylindrical, contractile portions of a muscle fiber, which are composed of even smaller myofilaments, are called .

The smallest contractile unit of a muscle is a: fiber myofibril sarcomere myofilament

Within each muscle fiber are hundreds or thousands of cylindrical structures that runs the entire length of the muscle fiber. These are called Blank______.Multiple choice question.myofilamentsT-tubulessarcomeresmyofibrils

From the outside of a muscle coming in, the first thing encountered would beMultiple Choicefascia.fascicle.dense connective tissue.muscle fiber.myofibril.

What is the name of the contractile protein fibres within muscle fibres?

What is the name for the bundles of skeletal muscle fibers in a whole muscle?Multiple choice question.FasciclesFasciaTendonsBursa