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Resting & Contraction Phase of Muscle Fibre Video Lecture | Biology for Grade 11

FAQs on Resting & Contraction Phase of Muscle Fibre Video Lecture - Biology for Grade 11

1. What is the resting phase of a muscle fibre?
Ans. The resting phase of a muscle fibre refers to the period when the muscle is not being actively contracted or stimulated. During this phase, the muscle is in a relaxed state and not exerting any force.
2. What is the contraction phase of a muscle fibre?
Ans. The contraction phase of a muscle fibre is when the muscle is actively contracting and exerting force. This occurs when the muscle receives a signal from the nervous system to contract, causing the muscle fibres to shorten and generate tension.
3. How long does the resting phase of a muscle fibre last?
Ans. The duration of the resting phase of a muscle fibre can vary depending on the individual and the specific muscle. Generally, the resting phase can last anywhere from a few milliseconds to several seconds before the muscle is stimulated to contract again.
4. What happens during the resting phase of a muscle fibre?
Ans. During the resting phase of a muscle fibre, the muscle is able to replenish its energy stores and remove any waste products that may have accumulated during the contraction phase. This allows the muscle to recover and prepare for the next contraction.
5. How does the contraction phase of a muscle fibre occur?
Ans. The contraction phase of a muscle fibre occurs when a signal from the nervous system, known as an action potential, triggers the release of calcium ions inside the muscle cell. These calcium ions then bind to proteins within the muscle fibres, causing them to slide past each other and generate force. This process is known as the sliding filament theory and is responsible for muscle contraction.
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