fibrillae Synonyms
No Synonyms and anytonyms found
fibrillae Meaning
Webster
fibrillae (pl.)
of Fibrilla
fibrillae Sentence Examples
- Muscle fibrillae, also known as myofibrils, are the fundamental contractile units of skeletal muscle fibers.
- Each muscle fibril is composed of a repeating arrangement of sarcomeres, which are the basic units of muscle contraction.
- The thick filaments of a sarcomere are composed of the protein myosin, while the thin filaments are composed of actin and regulatory proteins like troponin and tropomyosin.
- During muscle contraction, the thick and thin filaments slide past each other, driven by the interaction of myosin and actin molecules, a process known as the sliding filament mechanism.
- The sarcoplasmic reticulum, a specialized endoplasmic reticulum network within muscle cells, stores calcium ions necessary for muscle contraction and releases them when a nerve impulse triggers muscle activation.
- Motor neurons, which are specialized nerve cells, transmit signals from the central nervous system to muscle fibers, triggering the release of calcium ions from the sarcoplasmic reticulum.
- The release of calcium ions from the sarcoplasmic reticulum leads to the binding of calcium to troponin on the thin filaments, which initiates the conformational changes that allow myosin to interact with actin and drive muscle contraction.
- The sliding filament mechanism results in the shortening of the sarcomeres and, consequently, the muscle fiber, leading to muscle contraction and movement.
- Muscle relaxation occurs when calcium ions are actively pumped back into the sarcoplasmic reticulum, causing troponin to return to its original conformation and blocking the interaction between myosin and actin.
- The organization of muscle fibrillae into sarcomeres and the sliding filament mechanism of muscle contraction allow for precise control of muscle force and movement.
FAQs About the word fibrillae
of Fibrilla
No synonyms found.
No antonyms found.
Muscle fibrillae, also known as myofibrils, are the fundamental contractile units of skeletal muscle fibers.
Each muscle fibril is composed of a repeating arrangement of sarcomeres, which are the basic units of muscle contraction.
The thick filaments of a sarcomere are composed of the protein myosin, while the thin filaments are composed of actin and regulatory proteins like troponin and tropomyosin.
During muscle contraction, the thick and thin filaments slide past each other, driven by the interaction of myosin and actin molecules, a process known as the sliding filament mechanism.
