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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.
The thin filaments of a sarcomere consist of?
The length of the thick filament is the A band. The A band contains both thick and thin filament because they are overlapping each other. The H band is thick filament only, however, it only covers a portion of width of the thick filament.
What is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
What band does not change its length during shortening of the sarcomere?
The thick filaments (made of myosin) do not change length during shortening of the sarcomere. They slide past the thin filaments (made of actin) to generate muscle contraction.
Which region of the sarcomere shortens during contraction the dark band the light band or both?
During contraction, the H zone and I band shorten while the A band remains the same length. The A band is the dark band in the sarcomere that contains the thick filaments, the I band is the light band composed of thin filaments, and the H zone is the area in the center of the sarcomere where only thick filaments are present.
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.
Which characteristic is not seen in both water molds and slime molds?
One characteristic not seen in both water molds and slime molds is the presence of true multicellularity. Water molds (oomycetes) are primarily unicellular or form simple filaments, while slime molds can exhibit complex multicellular structures during their life cycle, such as the plasmodium stage. Additionally, water molds are classified as fungi-like protists that absorb nutrients from their environment, whereas slime molds can exhibit behaviors similar to amoebas, including movement and foraging.
What structures anchor thin filaments?
I believe the Z-lines anchor the Thin filaments
Myofibrils are composed primarily of two protein filaments called?
thick filaments and 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.
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
What is the h-zone missing?
Thin filaments
