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Both do have actin and myosin.
Within each skeletal muscle fiber are hundreds of lengthwise subdivisions called myofibrils.
Myofibrils are made up of bundles of the protein filaments (myofilaments) that are responsible for muscle contraction: thin filaments: made of the protein actin, and
thick filaments: made of the protein myosin.
These are visible using a microscope.
The internal organization of actin and myosin in smooth muscle is different from that in the striated muscles.
Smooth muscle cells: are long and slender, are spindle shaped, with a single, central nucleus, have scattered myosin fibers, with more heads per thick filament and have actin filaments attached to dense bodies.
These can not be seen using a microscope and that is why they are also called smooth muscle fibers.
What else can I help you with?
What filament is connected to the Z line thick or thin?
The filament connected to the Z line in a muscle cell is thin filament, specifically actin filament. Thick filaments (myosin) are connected to the M line in the sarcomere.
How does a lack of calcium reuptake to the sacroplasmic reticulum affect the muscle?
The thin filament sites remain open to the binding and stroke of the thick filament and there would be no muscle relaxation without the reuptake of Ca 2+ so the thin filament sites are closed.
How many subunits in thick filament?
Thick filaments in muscle fibers are primarily composed of myosin molecules, which consist of two heavy chains and four light chains each. Each thick filament is typically made up of around 200 to 300 myosin molecules, giving it a complex structure. This arrangement allows for the interaction with thin filaments during muscle contraction.
This area contains overlapping thin and thick filaments?
This area is the A band of a sarcomere, which contains both thick myosin filaments and thin actin filaments. The overlapping of these filaments is essential for muscle contraction to occur through the sliding filament mechanism.
What is the thick myofilament needed ofr muscle contraction?
The thick myofilament required for muscle contraction is primarily composed of the protein myosin. Myosin molecules have long tails and globular heads that interact with the thin myofilament, actin, during the contraction process. This interaction, facilitated by ATP hydrolysis, allows the muscle fibers to shorten and generate force. The coordinated action of thick and thin filaments is fundamental to muscle contraction in skeletal, cardiac, and smooth muscle.
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 filament is connected to the Z line thick or thin?
The filament connected to the Z line in a muscle cell is thin filament, specifically actin filament. Thick filaments (myosin) are connected to the M line in the sarcomere.
What protein is not in thin filament?
Myosin is a protein that is not found in the thin filament. Myosin is a motor protein that is primarily found in the thick filament of muscle cells and is responsible for muscle contraction. The thin filament contains proteins such as actin, tropomyosin, and troponin.
In the sliding filament mechanism the thin filament is being pulled toward the?
M-line, causing overlap with the thick filament during muscle contraction. This results in the sarcomere shortening and overall muscle contraction.
What filament is responsible for the pulling and what filament is pulled in the sliding filament theory?
In the sliding filament theory of muscle contraction, the thin filament (actin) slides over the thick filament (myosin). Myosin is responsible for pulling the actin filaments towards the center of the sarcomere during muscle contraction.
Which protein of the sarcomere is the thick filament made of?
The thick filament of the sarcomere is primarily made of the protein myosin. Myosin molecules aggregate to form the thick filaments, which interact with the thin filaments (primarily composed of actin) during muscle contraction. This interaction is crucial for the sliding filament model of muscle contraction, allowing muscle fibers to shorten and generate force.
What is the thin filament of the myocardial cell?
The thin filament of a myocardial cell is composed primarily of actin, tropomyosin, and troponin proteins. These proteins play a crucial role in regulating the contraction and relaxation of the heart muscle by interacting with the thick filament during the process of muscle contraction.
Is myosin a thick filament that forms the cross bridge in a protein?
Yes, myosin is a thick filament that plays a crucial role in muscle contraction. It forms cross-bridges with actin, a thin filament, facilitating the sliding filament mechanism. The interaction between myosin and actin, powered by ATP hydrolysis, allows for muscle contraction and movement.
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 happens when thin filaments in a muscles fiber slide over the thick filament?
Contraction or relaxation of muscle fibre, due to similar effect in sarcomere
What chemical ion is responsible for initiating the contraction of a muscle fiber?
Calcium ions bind to the thin filament ( actin ), turn it and expose the binding site to the thick filament (myosin ).
How does a lack of calcium reuptake to the sacroplasmic reticulum affect the muscle?
The thin filament sites remain open to the binding and stroke of the thick filament and there would be no muscle relaxation without the reuptake of Ca 2+ so the thin filament sites are closed.
