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Skeletal Muscle Tissue

  1. Skeletal muscle functions
    • produce skeletal movement
    • maintain posture and body position
    • support soft tissue
    • guard entrance and exits
    • maintain body temperature
  2. Epimysium
    surrounds entire gross muscle (outermost covering)
  3. Perimysium
    • divides the skeletal muscles into smaller compartments
    • each compartment contains a bundle of fibers referred to as a fascicle
    • covers muscle fascicles
  4. Endomysium
    • thin sheet of connective tissue that surrounds each individual muscle fiber.
    • Lies just over the cell membrane (NOT the cell membrane or sarcolemma)
    • covers muscle fibers
  5. Tendon
    connective tissue that connects muscle to bone
  6. Ligament
    connective tissue that connects bone to bone
  7. Muscle fiber
    • muscle cell which is usually spindle shaped and multinucleated
    • surrounded by endomysium
  8. Sarcolemma
    plasma membrane of a muscle fiber
  9. Sarcoplasm
    cytoplasm of muscle fiber (fluid floating around in fiber)
  10. Transverse (T) tubules
    • deep invaginations of sarcolemma into the sarcoplasm
    • stuff outside can go in
  11. Myofibril
    next level down from (pulling things out of) muscle fiber
  12. Myofilament
    • smallest unit
    • made of thick and thin myofilaments
  13. Thick myofilament
    chiefly composed of the protein myosin
  14. Thin myofilament
    chiefly composed of the protein actin
  15. Sarcoplasmic reticulum
    • internal membrane complex
    • sealed organelle
    • reservoir for calcium ions
  16. Terminal cisternae
    • either side of T tubule running perpendicular to muscle fiber's length
    • reservoirs for calcium ions
  17. Sarcomere
    functional contractile unit of muscle (unit of contraction)
Author
trsmartblonde
ID
109306
Card Set
Skeletal Muscle Tissue
Description
Functions of muscles and organization of connective tissue in muscles
Updated

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