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Factors, such as hormones and stress (and artificial anabolic steroids), acting on the muscle can increase the production of sarcomeres and myofibrils within the muscle fibers, a change called hypertrophy, which results in the increased mass and bulk in a skeletal muscle.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Sep 26, 2024 · Every skeletal muscle is richly supplied by blood vessels for nourishment, oxygen delivery, and waste removal. In addition, every muscle fiber in a skeletal muscle is supplied by the axon branch of a somatic motor neuron, which signals the fiber to contract.
Jul 30, 2022 · A skeletal muscle fiber is surrounded by a plasma membrane called the sarcolemma, which contains sarcoplasm, the cytoplasm of muscle cells. A muscle fiber is composed of many fibrils, which give the cell its striated appearance.
In this review, we discussed the key processes of skeletal muscle at two stages of myogenesis, including nuclear‐related behaviors in the embryonic and fetal stages and biological functions as well as poststimulation changes in adulthood.
Inside each skeletal muscle, muscle fibers are organized into bundles, called a fascicle, by a middle layer of dense irregular connective tissue called the perimysium.
Skeletal muscle fibers can be divided into two types, called slow-twitch (or type I) muscle fibers and fast-twitch (or type II) muscle fibers. Slow-twitch muscle fibers are dense with capillaries and rich in mitochondria and myoglobin, a protein that stores oxygen until needed for muscle activity.
Heart muscle cells resemble skeletal muscle fibers in that their actin and myosin filaments are aligned in very orderly arrays to form a series of contractile units called sarcomeres, so that the cells have a striated (striped) appearance.
