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The sliding filament theory is the explanation for how muscles produce force (or, usually, shorten). It explains that the thick and thin filaments within the sarcomere slide past one another, shortening the entire length of the sarcomere. In order to slide past one another, the myosin heads will interact with the actin filaments and, using ATP, bend to pull past the actin.
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Sliding filament model which proteinS have a calcium binding site?
The actin filaments have a Ca+2 binding site.
What are the steps in sliding filament theory?
Before contraction:1) no nerve impulse to myoneural junction.2) Ca++ in the sarcoplasmic reticulum3) combining of actin and myosin is prevented by a tropomyosin-troponin complex that attatches to the actin.Contraction:1) an action potential (nerve impulse) travels along a neural axon to a myoneural junction (synapse)2) Acetylcholine (neurotransmitter) is released from the synaptic vesicles of the neuron.3) acetylcholine diffuses over into the sacrolemma and the t-tubules.4) Ca++mis released from the sarcoplasmic reticulum.5) the Ca++ then binds to the actin degrading the tropomyosin-troponin complex to expose myosin attatchment sights6) the heads of the myosin myofilaments attatch to the exposed attatchment sights on actin filament7) ATP binds to the heads of the myosin filaments. breakdown of the ATP to ADP+p releases energy and causes a bending of myosin heads.8) another ATP binds to the myosin head causing it to release the actin filament then attatch again with the head unbent. again the ATP breaks down and the process continues.To relax:1) nerve impulse stops2) active transport returns Ca++ to the sarcoplasmic reticulum3) ATP's are reformed (ADP+P+energy=ATP)4) Tropomyosin-troponin complex reforms causing the myosin to release the actin5) when the filaments release each other they slide back to the resting position.
The sliding filament mechanism of muscle contraction involves?
during contraction, the thin filaments slide past the thick filaments so that actin and myosin filaments overlap.
What is the model that best describes the contraction of the muscle called?
There are different models that describe the contraction of muscles. Not everyone agrees on which is best. A couple of the models are the sliding-filament model and Huxley's model.
What is the part of a flower which holds up the anther?
Filament
Who proposed the sliding filament theory?
The sliding filament theory of muscle contraction was proposed by Andrew Huxley and Rolf Niedergerke in 1954.
When muscles contract do the myofilaments themselves actually shrink?
the myofilaments themselves do not contract, they slide, this is called the Sliding Filament theory, in which the thick filament (Myosin) slides over the thin filament (Actin).
Physical evidence that supports the sliding filament theory of muscle contraction includes?
decreased width of the H band during contraction
In isometric contraction how does the muscle stay the same length when the sarcomeres are shortening according to the sliding filament theory?
Dear freind! there is not any filamnet sliding in isometric contraction and so there is no work...
The sliding filament model of contraction involves .?
The sliding filament model of contraction involves actin filaments overlapping myosin filaments.
What is the birth name of Huxleys?
Huxleys's birth name is Mariafe Ponce.
Principle by which muscle fibers contract?
Sliding filament mechanism
Which myofilaments actually do the pulling during the sliding filament model of muscle contraction?
thick filaments
Sliding filament model which proteinS have a calcium binding site?
The actin filaments have a Ca+2 binding site.
What makes skeletal muscles move?
The nervous system produces electrical impulses which make muscles move through a sliding filament mechanism.
What are the steps in sliding filament theory?
Before contraction:1) no nerve impulse to myoneural junction.2) Ca++ in the sarcoplasmic reticulum3) combining of actin and myosin is prevented by a tropomyosin-troponin complex that attatches to the actin.Contraction:1) an action potential (nerve impulse) travels along a neural axon to a myoneural junction (synapse)2) Acetylcholine (neurotransmitter) is released from the synaptic vesicles of the neuron.3) acetylcholine diffuses over into the sacrolemma and the t-tubules.4) Ca++mis released from the sarcoplasmic reticulum.5) the Ca++ then binds to the actin degrading the tropomyosin-troponin complex to expose myosin attatchment sights6) the heads of the myosin myofilaments attatch to the exposed attatchment sights on actin filament7) ATP binds to the heads of the myosin filaments. breakdown of the ATP to ADP+p releases energy and causes a bending of myosin heads.8) another ATP binds to the myosin head causing it to release the actin filament then attatch again with the head unbent. again the ATP breaks down and the process continues.To relax:1) nerve impulse stops2) active transport returns Ca++ to the sarcoplasmic reticulum3) ATP's are reformed (ADP+P+energy=ATP)4) Tropomyosin-troponin complex reforms causing the myosin to release the actin5) when the filaments release each other they slide back to the resting position.
What happens when muscles contract?
It's a very complex process, but presuming you're familiar with the structure of muscle fibres you need only to Google "Sliding Filament Theory". This is the way that the scientific community believes that muscles shorten, or contract. You should find loads of information on Google and Google Scholar for more indepth stuff.
