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What chemical triggers sliding of muscle filaments?
ATP
Which step allows actin and myosin to release from each other?
an ATP molecule attaches to myosin apex answers
Why is ATP necessary for cell nutrition?
ATP allows our cells to maintain, repair and reproduce themselves.
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 is the name applied to the cycle by which ATP is broken down to ADP with the release of energy and the regeneration of ATP from ADP through the process of phosphorylation?
ATP Cycle or the Krebs cycle or citric acid cycle.
Atp allows these filaments to release and reset?
osin or actin
What chemical triggers sliding of muscle filaments?
ATP
Which molecule provides the energy to slide filaments?
atp
Rigor mortis in a corpse results from the fact that?
thick filaments cannot let go of the thin filaments without ATP
What molecule directly supplies energy to myosin to allow the filaments to contract?
ATP
Which step allows actin and myosin to release from each other?
an ATP molecule attaches to myosin apex answers
What controls the release of ATP?
What controls the release of ATP?
Why is ATP necessary for nutritions?
ATP allows our cells to maintain, repair and reproduce themselves.
Which protein complex allows hydrogen ions to rush out of the thylacoid providing energy that can be used to make a molecule?
ATP synthase allows H+ ions to pass through the thylakoid membrane.
Why is ATP necessary for cell nutrition?
ATP allows our cells to maintain, repair and reproduce themselves.
What happens to a sarcomere when muscle length changes?
1. Arrangement of thick and thin filaments: In each sarcomere two sets of actin filaments extend partway toward the center. The myosin filaments are arranged such that they partially overlap the actin filaments. Myosin heads on each side point away from the center of the sarcomere.2. During contraction, the interaction of myosin heads with the actin filaments pulls the thin filaments toward the center of the sarcomere. The actin and myosin filaments slide past each other.3. Cross-bridges = attachement betwn myosin heads and binding sites on actin filaments.4. When a muscle cell is stimulated, myosin heads are energized by ATP. They attach to adjacent actin filaments, and tilt in a short "power stroke" toward the center of the sarcomere. Each power sroke requires an ATP. With many power strokes in rapid succession, the actin filaments are made to slide past the myosin filaments.
What occurs when actin and myosin filaments slide over each other?
The power stroke of the cross bridge which binds ATP disconnecting it from the actin.
