Muscle tissue consists of cells that are highly specialized for ________________.
contraction
Functions of Skeletal Muscle
- produce movement
-maintain posture
-maintain body temperature
-guard body entrances and exits
-support soft tissue
-store nutrients
At the end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a _____________.
tendon
Epimysium
-dense layer of connective tissue that surrounds an entire skeletal muscle
Nerves and blood vessels that service a muscle fiber are located in the connective tissue of its _____________.
endomysium
Fascicle
-a group of muscle fibers that are encased in the perimysium
Endomysium
-delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together
Tendon
-bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone.
*ATTACHES MUSCLE TO BONE
Put the following structures in order from superficial to deep:
1. muscle fiber
2. perimysium
3. myofibril
4. fascicle
5. endomysium
6. epimysium
624513
Interactions between actin and myosin filaments of the sarcomere are responsible for __________________.
muscle contraction
In a sarcomere, thick filaments are linked laterally by proteins of the ___________.
M line
The advantage of having many nuclei in a skeletal muscle fiber is_________________.
the ability to produce nutrients for muscle contraction
Skeletal muscle fibers are formed from embryonic cells called _________________.
Myoblasts
Sarcomere
-the repeating unit of a skeletal muscle fiber
-repeating unit of striated myofibrils
Sarcolemma
-the plasma membrane of a skeletal muscle fiber
Muscle Fibers
-have many nuclei
Sarcoplasmic Reticulum
-storage and release site for calcium ions
Z Line
-thin filaments are anchored here
A Band
-region of the sarcomere containing thick filaments
Triad
-the skeletal muscle complex consists of a transverse tubule and two terminal cisternae
Cross-bridges are portions of_______________.
myosin molecules
H Band
-the area in the center of the A band that contains no thin filaments