10 Questions
What is the basic functional unit of the muscle fiber?
Sarcomere
What protein primarily composes the thick filaments in a sarcomere?
Myosin
Which of the following proteins is NOT present in the thin filaments?
Myosin
What separates one sarcomere from another in the muscle fiber structure?
Z disks
What is the role of tropomyosin in the thin filaments of the sarcomere?
Regulating the interaction between actin and myosin
Which structures are responsible for the striations in muscle fibers?
Dark A bands and light I bands
What structure runs through the center of the H zone?
M line
Which band is bisected by the Z line?
I band
The A band is bisected by which zone?
H zone
What is the primary function of the M line in muscle fibers?
Bisecting the A band
Study Notes
Sarcomere
- The basic functional unit of a muscle fiber consists of an array of thick and thin filaments between two Z disks.
Filament Composition
- Thick filaments: composed of myosin protein molecules
- Thin filaments: composed of actin protein molecules, plus smaller amounts of troponin and tropomyosin
Striations
- Characterized by dark A bands and light I bands
A Band
- Bisected by the H zone
- Contains the M line or band, running through the center of the H zone
I Band
- Bisected by the Z disk or line
Learn about the basic functional unit of muscle fibers, including the structure and components of thick and thin filaments between two Z disks.
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