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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.
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.
What structures anchor thin filaments?
I believe the Z-lines anchor the Thin filaments
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.
How is the H band distinguished from the other prominent structural features of the sarcomere?
The H band is located at the center of the A band in the sarcomere and is where only thick filaments (myosin) are present, with no overlap with thin filaments (actin). It appears lighter under a microscope due to the organization of filaments. This region shortens during muscle contraction as the myosin filaments slide past the actin filaments towards the M line.
Myofibrils are composed primarily of two protein filaments called?
thick filaments and thin filaments
Thin filaments at either end of the sarcomere are attached to interconnecting filaments that make up the what?
The thin filaments at either end of the sarcomere are attached to interconnecting filaments called Z-lines or Z-discs. These structures help anchor and align the thin filaments during 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.
The thick filaments of muscle fibers are composed of what?
Myosin
What is H zone?
Thin filaments
What are the 3 different types of myofilaments?
The three different types of myofilaments are thick filaments, thin filaments, and elastic filaments. Thick filaments are composed of myosin protein, thin filaments are primarily made of actin protein, and elastic filaments (also known as titin) provide elasticity and stability to the sarcomere.
What muscle cell filaments come closer together when the sarcomere shortens?
thin filaments
