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Are there more thick filaments than thin filaments in smooth muscle?
There more thin filaments than thick filaments in smooth muscle. The ratio is of the thin to thick filaments in the smooth muscle is approximately 15:1.
The thick filaments of muscle fibers are composed of what?
Myosin
What are the roles of thick and thin filaments in muscle contraction?
The thin filaments are actin, and the thick filaments are myosin. The filaments run parrel to one another along the length of the sarcomere.The dark bands that occur in the middle of the sarcomere are regions where the thick filaments and thin filaments overlap.
What are the 3 types of filaments within a muscle and what protein makes up each filament?
The three types of filaments within a muscle are thin filaments, thick filaments, and elastic filaments. Thin filaments are primarily composed of the protein actin, while thick filaments are made up of myosin. Elastic filaments, which help maintain the structure and elasticity of the muscle, are primarily composed of the protein titin. These filaments work together to facilitate muscle contraction and relaxation.
What is the structure and function of the muscle I band in skeletal muscle fibers?
The muscle I band is a region in skeletal muscle fibers that contains only thin filaments made of actin. Its main function is to anchor the thin filaments and help maintain the structure of the muscle fiber during contraction and relaxation.
What is the significance of the i band in muscle physiology?
The i band in muscle physiology is important because it contains the thin filaments made of actin. These filaments play a crucial role in muscle contraction by interacting with the thick filaments made of myosin. The i band shortens during muscle contraction, allowing the muscle to generate force and movement.
What are actin and myosin and are they organized iin a muscle?
Thick filaments are made of the protein myosin and thin filaments are made of the protein actin. Myosin and actin filaments are arranged to form and overlapping pattern which gives muscle tissue its striated appearance.
What muscle shapes the muscle?
thick and thin bands (lines) of filaments.
What muscle cell filaments come closer together when the sarcomere shortens?
thin filaments
What is the significance of the i band in muscle physiology and how does it contribute to the overall structure of a muscle band?
The I band in muscle physiology is important because it contains only thin filaments made of actin. This band is where actin filaments attach to the Z line, which helps to stabilize the structure of the muscle fiber. The I band contributes to the overall structure of a muscle by providing a region where the thin filaments can slide past the thick filaments during muscle contraction, allowing the muscle to shorten and generate force.
What is point of attachment for thin filaments?
Thin filaments in muscle cells attach to the Z-discs, which are structures that anchor the filaments and help in muscle contraction. The Z-discs are located at the ends of the sarcomere, which is the basic contractile unit in muscle fibers. The attachment of thin filaments to the Z-discs allows for the sliding mechanism that is essential for muscle contraction.
Which of the following become connected by myosin cross-bridges during muscle contraction A) thin filaments and thick filaments B) thin filaments and t-tubules C) thick filaments and titin filame?
Interactions between actin and myosin filaments of the sarcomere are responsible for muscle contractions. The I bands contain only thin (actin) filaments, whereas the A bands contain thick (myosin) filaments.
