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Questions and Answers
What is the basic functional unit of the muscle fiber?
What is the basic functional unit of the muscle fiber?
- Myofibril
- Mitochondrion
- Sarcomere (correct)
- Tendon
What protein primarily composes the thick filaments in a sarcomere?
What protein primarily composes the thick filaments in a sarcomere?
- Myosin (correct)
- Actin
- Tropomyosin
- Troponin
Which of the following proteins is NOT present in the thin filaments?
Which of the following proteins is NOT present in the thin filaments?
- Tropomyosin
- Actin
- Troponin
- Myosin (correct)
What separates one sarcomere from another in the muscle fiber structure?
What separates one sarcomere from another in the muscle fiber structure?
What is the role of tropomyosin in the thin filaments of the sarcomere?
What is the role of tropomyosin in the thin filaments of the sarcomere?
Which structures are responsible for the striations in muscle fibers?
Which structures are responsible for the striations in muscle fibers?
What structure runs through the center of the H zone?
What structure runs through the center of the H zone?
Which band is bisected by the Z line?
Which band is bisected by the Z line?
The A band is bisected by which zone?
The A band is bisected by which zone?
What is the primary function of the M line in muscle fibers?
What is the primary function of the M line in muscle fibers?
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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
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