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Which step allows actin and myosin to release from each other?
an ATP molecule attaches to myosin apex answers
What chemical triggers sliding of muscle filaments?
The chemical that triggers the sliding of muscle filaments is calcium ions. When muscle cells receive a signal to contract, calcium ions are released into the muscle cell, binding to specific proteins and initiating the sliding mechanism between actin and myosin filaments in the muscle cells.
What must be present for muscle contraction to occur?
- Multiple Fibre Summation Related to the central nervous system sending signals to contract muscles. - Frequency summation Related to when action potentials sent to muscles synchronously. Check the related links below for more information.
Why is ATP considered such a good energy currency molecule?
ATP is considered a good energy currency molecule because it can easily release and transfer energy for various cellular processes. Its structure allows for quick energy release when needed, making it efficient for powering cellular activities. Additionally, ATP can be rapidly regenerated in cells, ensuring a continuous supply of energy for metabolic reactions.
How do ADP and ATP differ in amount of potential chemical energy?
ATP has higher potential chemical energy compared to ADP due to the presence of an extra phosphate group in ATP. This extra phosphate group allows ATP to store and release energy more readily during cellular processes. When ATP is hydrolyzed to ADP, energy is released and can be used by the cell for various functions.
Atp allows these filaments to release and reset?
osin or actin
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?
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 step allows actin and myosin to release from each other?
an ATP molecule attaches to myosin apex answers
What substances does excitation contraction coupling requires?
Excitation-contraction coupling in muscle cells requires calcium ions (Ca2+), ATP (adenosine triphosphate), and voltage-gated ion channels. The release of Ca2+ from the sarcoplasmic reticulum triggers muscle contraction by binding to troponin, which allows myosin to interact with actin filaments. ATP provides the energy needed for muscle contraction and relaxation processes. Voltage-gated ion channels help propagate action potentials along the muscle cell membrane, leading to the release of Ca2+ from the sarcoplasmic reticulum.
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 event causes cross bridge detachment?
The binding of ATP to the myosin head causes cross bridge detachment by disrupting the binding between myosin and actin. ATP provides the energy necessary for myosin to release from actin and reset for the next contraction cycle.
What causes cross bridge detachment?
Cross bridge detachment occurs when ATP binds to the myosin head, causing it to release from the actin filament. This process is necessary for the muscle to relax and reset for another contraction.
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 is cross bridge cycling?
when the Thick filaments pull the thin filaments toward the center of the sarcomere
