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When the crossbridge of the myosin molecule forms linkages with actin filaments the result is?
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What is the crossbridge cycle?
The crossbridge cycle is the cyclical formation of links between actin and myosin. This results in the sliding of thin filaments towards the M line of a sarcomere. The myosin head undergoes conformation changes which allows it to swivel back and forth. In its low energy form, myosin has a low affinity for actin. The ATP prepares myosin for binding with actin by moving it to its high energy form position. When myosin contracts, it has a high affinity for actin.
Binding of the myosin heads sequentially prevents what?
myosin crossbridge binding
What molecule directly supplies energy to myosin to allow the filaments to contract?
ATP
What are the thick protein filaments in the cell made of?
The thick filament is composed of the myosin molecule. The thin filament is composed of the actin molecule. Flexing the head of myosin provides the powerstroke.
What protein makes up the thick filaments of myofibrils?
Myosin makes up the THICK filaments, and actin makes up the thin filaments of myofibrils.
The thick filaments of muscle fibers are composed of what?
Myosin
What are the names of protein filaments in a muscle fiber?
Actin Filaments
When the cross-bridge of the myosin molecule form linkage with actin filaments the result s what?
shortening of the muscle fiber
Thick protein filaments within the A-bands?
Myosin. The A band has thick (myosin) and thin (actin) filaments.
What is composed of myosin?
Thick Filaments
Where is myosin found?
In thick filaments
Are myosin filaments located in an A band?
Thick - it is the length of myosin.
