During muscle contraction, myosin cross bridges attach to active sites of ACTIN FILAMENTS.
During Metaphase the protein strands that attach to the centromere region are called spindle fibres.
the correct answer is bone.
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it happens because it helps to keep the beaker stable with no shaking
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myosin
During skeletal muscle contraction myosin cross bridges attach to active sites of actin filaments. Actin filaments bind ATP. Their growth is regulated by thymosin and profilin.
Myosin functions as an ATPase utilizing ATP to produce a molecular conformational change of part of the myosin and produces movement. Movement of the filaments over each other happens when the globular heads protruding from myosin filaments attach and interact with actin filaments to form crossbridges. The myosin heads tilt and drag along the actin filament a small distance (10-12 nm). The heads then release the actin filament and adopt their original conformation.
actin filaments
For attachment of myosin heads to actin, calcium ions must bind to troponin, causing tropomyosin to move out of the way, exposing the binding site on actin. ATP then binds to the myosin head, leading to its activation and attachment to actin. For detachment, ATP is hydrolyzed, causing a conformational change in the myosin head that releases it from actin.
actin filaments in muscle cells during muscle contraction.
The two myofilaments that slide past one another to enable muscle contraction are actin and myosin. Actin makes up thin filaments while myosin forms thick filaments. During muscle contraction, myosin heads attach to actin filaments and pull them towards the center of the sarcomere, causing the muscle to shorten.
Myosin makes up the THICK filaments, and actin makes up the thin filaments of myofibrils.
Actin and myosin
1. Muscles fibers with a large diameter develop more force, and have more myofibrils and more myosin heads that can attach to actin. The amount of force is dependent on the number of myosin heads attached to actin.
The thick protein filaments in a cell are primarily made of a protein called myosin. Myosin filaments are involved in muscle contraction and various other cellular processes such as cell motility and cytokinesis.
Myosin is responsible for actin-based muscular mobility/contraction.