Contraction can be sustained for a long period of time by:
Correct answer: B. Smooth muscles
- A. Skeletal muscles
- B. Smooth muscles
- C. Cardiac muscles
- D. All of the above
Explanation
Smooth muscles are uniquely adapted to sustain long-term contractions with minimal energy consumption. This ability is crucial for functions such as peristalsis in the digestive tract. In contrast, skeletal muscles, while capable of brief sustained contractions, fatigue more quickly due to higher energy demands. Cardiac muscles, although enduring, are designed for continuous rhythmic contractions rather than prolonged static tension. Therefore, smooth muscles are the most efficient for sustained contractions.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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More Muscle Contraction questions
Sarcomere is part of myofibril between:
Thick filaments in skeletal muscles are composed of:
The accumulation of 'lactic acid' in the muscles results in:
During muscle relaxation, the calcium ions are:
The sarcomere is the region of a myofibril between two successive:
According to the sliding filament hypothesis, the release of_ from the sarcoplasmic reticulum causes the reorientation of certain components in the thin filament, permitting them to bind with extension from the thick myosin filaments: