What is the name for the linkage that forms between actin and myosin during muscle contraction?
Question
What is the name for the linkage that forms between actin and myosin during muscle contraction?
Solution 1
The name for the linkage that forms between actin and myosin during muscle contraction is called a Cross-Bridge.
Here are the steps of how it forms:
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The process begins when a nerve impulse reaches the muscle fiber. This causes the release of calcium ions.
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The calcium ions bind to a protein called troponin, which is located on the actin filament. This causes a shift in another protein called tropomyosin, which normally blocks the binding sites for myosin on the actin filament.
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Once the binding sites are exposed, the myosin heads can bind to the actin filament, forming a cross-bridge.
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After the cross-bridge is formed, the myosin head pivots, pulling the actin filament towards the center of the sarcomere. This is what causes the muscle to contract.
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ATP (adenosine triphosphate) then binds to the myosin head, causing it to detach from the actin filament.
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The ATP is then broken down into ADP (adenosine diphosphate) and a phosphate group, which provides the energy for the myosin head to return to its original position.
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The process can then start again, leading to further muscle contraction.
Solution 2
The name for the linkage that forms between actin and myosin during muscle contraction is called a Cross-Bridge.
Here are the steps of how it forms:
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The process begins with the myosin head attached to an ATP molecule in a low-energy configuration.
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The ATP molecule is hydrolyzed by myosin, which changes the shape of the myosin head into a high-energy configuration and also releases an inorganic phosphate molecule.
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The high-energy myosin head then binds to the actin filament forming a cross-bridge.
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After the cross-bridge formation, the inorganic phosphate molecule is released, and the myosin head pivots to a low-energy state, pulling the actin filament along with it. This is known as the power stroke.
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A new ATP molecule binds to the myosin head, causing it to detach from the actin filament.
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The cycle can
Similar Questions
Which of the following happens as actin and myosin filaments slide past each other during muscle contraction?
When cross-bridges form and the muscle fibers contract, the actin myofilament slides past the myosin myofilament.Group startsTrue or False
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Click and drag on elements in orderPlace the events of skeletal muscular contraction in chronological order.InstructionsDrag and drop application.Choice 1 of 6. Active sites exposed on G actin. toggle buttonActive sites exposed on G actin.Choice 2 of 6. ACh binds to the postsynaptic membrane stimulating an action potential in the sarcolemma. toggle buttonACh binds to the postsynaptic membrane stimulating an action potential in the sarcolemma.Choice 3 of 6. Myosin binds to actin and pulls actin towards center of sarcomere. toggle buttonMyosin binds to actin and pulls actin towards center of sarcomere.Choice 4 of 6. Action potential reaches presynaptic terminal, allow for the exocytosis of acetylcholine. toggle buttonAction potential reaches presynaptic terminal, allow for the exocytosis of acetylcholine.Choice 5 of 6. Calcium is released into sarcoplasm and binds to troponin. toggle buttonCalcium is released into sarcoplasm and binds to troponin.Choice 6 of 6. Action potential travels along sarcolemma and along transverse tubules. toggle buttonAction potential travels along sarcolemma and along transverse tubules.
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