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Questions and Answers
Which of the following best describes the sliding filament theory?
Which of the following best describes the sliding filament theory?
- The contraction of skeletal muscle is caused by the overlapping of thick and thin filaments.
- The cross-bridge cycle is responsible for muscle contraction.
- The sliding of actin past myosin generates muscle tension. (correct)
- The shortening of the sarcomere results in the shortening of the actin filament length.
What is the role of actin in muscle contraction according to the sliding filament theory?
What is the role of actin in muscle contraction according to the sliding filament theory?
- Actin generates muscle tension by sliding past myosin. (correct)
- Actin is responsible for the cross-bridge cycle.
- Actin shortens the sarcomere and the muscle.
- Actin is tethered at each end of the sarcomere to z discs.
How does the shortening of the sarcomere contribute to muscle contraction?
How does the shortening of the sarcomere contribute to muscle contraction?
- The shortening of the sarcomere allows actin to slide past myosin.
- The shortening of the sarcomere generates tension and results in muscle contraction. (correct)
- The shortening of the sarcomere results in the shortening of the actin filament length.
- The shortening of the sarcomere activates the cross-bridge cycle.
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Study Notes
Muscle Contraction
- The sliding filament theory proposes that muscle contraction occurs when actin and myosin filaments slide past each other, resulting in muscle shortening.
- According to the sliding filament theory, actin plays a crucial role in muscle contraction by forming a dynamic complex with myosin, allowing for the sliding of filaments.
- The shortening of the sarcomere, the functional unit of muscle contraction, contributes to muscle contraction by reducing the distance between the Z-disks, leading to muscle fiber shortening.
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