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When the cross bridge of myosin molecule forms linkages with actin filaments what is the result is?
When the cross bridge of the myosin molecule forms linkages with actin filaments, it results in muscle contraction. This interaction allows myosin heads to pull the actin filaments toward the center of the sarcomere, shortening the muscle fiber. This process is powered by ATP hydrolysis, which provides the energy necessary for the myosin heads to change conformation and generate force. Ultimately, this cycle of attachment, pivoting, and detachment leads to the sliding filament mechanism of muscle contraction.
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When the cross-bridge of the myosin molecule form linkage with actin filaments the result s what?
shortening of the muscle fiber
When myosin is attached to actin this is called a?
When myosin is attached to actin, it forms a cross-bridge. This attachment allows for the sliding of actin filaments along myosin filaments, leading to muscle contraction.
When the crossbridge of the myosin molecule forms linkages with actin filaments the result is?
When the crossbridge of the myosin molecule forms linkages with actin filaments, it leads to muscle contraction through a process known as the power stroke. This interaction causes the myosin head to pivot, pulling the actin filament inward and shortening the muscle fiber. This cycle of attachment, pivoting, and detachment continues as long as calcium ions and ATP are present, enabling sustained muscle contraction. Ultimately, this mechanism is fundamental to the sliding filament theory of muscle contraction.
What are the thick protein filaments in the cell made of?
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.
What molecule directly supplies energy to myosin to allow the filaments to contract?
Adenosine triphosphate (ATP) is the molecule that directly supplies energy to myosin during muscle contraction. Myosin uses ATP to power the movement of actin filaments, leading to muscle contraction.
Which molecule has a binding site for myosin heads?
The molecule that has a binding site for myosin heads is actin. Actin filaments form the contractile apparatus in muscle fibers, and myosin heads bind to specific sites on the actin filaments during muscle contraction. This interaction is crucial for the sliding filament model of muscle contraction, where the myosin heads pull on the actin filaments to generate force.
The larger of the two filaments forming a cross-bridge is made of a protein called?
Myosin
What protein makes up the thick filaments of myofibrils?
Myosin makes up the THICK filaments, and actin makes up the thin filaments of myofibrils.
Do myosin filaments outnumber actin filaments in skeletal muscles?
No, actin filaments outnumber myosin filaments in skeletal muscles. Actin filaments are thin filaments, while myosin filaments are thick filaments. The arrangement and interplay of these filaments during muscle contractions are essential for movement.
The thick filaments of muscle fibers are composed of what?
Myosin
What is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
Atp allows what filaments to release and reset?
ATP allows actin and myosin filaments to release from each other during muscle contraction by assisting in the detachment of the myosin heads from actin. It also helps in resetting the myosin heads for the next contraction cycle by providing energy for the process of cross-bridge formation.
