+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
Excitability
|
Is the ability to be stimulated or irritability.
|
|
Contractility
|
Is the ability to contract or shorten, allows muscle tissue to pull on bones.
|
|
Extensibility
|
Is the ability to extend or stretch, allowing muscles to return to their resting length after having contracted.
|
 Sarcomere |
Is defined as the segment between two neighboring Z-lines (or Z-discs, or Z bodies).
|
 Z-Line |
the disc in between the I bands) appears as a series of dark lines.
|
|
I-band
|
(for isotropic) is the zone of thin filaments that is not superimposed by thick filaments.
|
|
A-Band
|
(for anisotriopic). Named for their properties under a polarizing microscope An A-band contains the entire length of a single thick filament.
|
|
H - Band
|
Named for their lighter appearance under a polarization microscope. H-band is the zone of the thick filaments that is not superimposed by the thin filaments.
|
|
M - Line
|
Inside the H-zone is a thin M-line the disc in the middle of the sarcomere) formed of cross-connecting elements of the cytoskeleton.
|
|
Elastic filaments
|
Are composed of titin (connectin), which anchor the ends of the thick filaments to the Z - Line.
|
|
Titin (connectin)
|
Extends from the Z-line of the sarcomere, where it binds to the thick filament (myosin) system, to the M-band,
|
|
Dystrophin
|
Is a protein that holds the actin filaments to the sarcolemma.
|
|
Sarcolemma
|
Is the plasma membrane of a muscle fiber.
|
|
Sarcoplasm
|
Is the cytoplasm found in the muscle fiber.
|
|
Sarcoplasmic reticulum (SR)
|
The special type of smooth endoplasmic reticulum found in smooth and striated muscle fibers whose function is to store and release calcium ions.
|
