a bundle; fascicle
convulsive tension; tetanus
a turning; tropomyosin
Functions of Skeletal Muscle (Approx. 700 muscles)
1) Produce movement of the skeleton; Contractions pull on tendons and thereby move the bones.
2) Maintain posture & body position; Continuous muscle contractions maintain body posture.
3) Support soft tissues; Support weight of Visceral organs and shield internal tissues from injury.
4) Guard entrances & exits; Provide voluntary control over swallowing, defecation, and urination.
5) Maintains body temperature; The heat released by working muscles, shivering.
Three layers of connective tissue part of each muscle
A layer of collagen fibers that surrounds the entire muscle and separates the muscle form surrounding tissues and organs.
Connective tissue fibers that divide the skeletal muscle into bundles of muscle fibers called fascicles. In addition to collagen and elastic fibers, it contains blood vessels and nerves that supply the fascicles.
Within the fascicles, it surrounds each skeletal muscle fiber and ties adjacent muscle fibers together. Stem cells scattered among the fibers help repair damaged muscle tissue.
At each end of the muscle, the collagen fibers of all three layers come together to form a bundle known as a Tendon.
Penetrate the epimysium, branch out through the perimysium, and enter the endomysium to control individual muscle fibers.
The cell membrane of a muscle fiber that surrounds the Sarcoplasm.
Transverse Tubules or T Tubules
A network of scattered openings across the surface of a sarcolemma, filled with extracellular fluid, form passageways through the muscle fiber. Electrical impulses reach the cell's interior by traveling them that extend deep into the sarcoplasm of the muscle fiber.