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What happens when acetycholine binds to its receptor in the sarcolemma and triggers?
When acetylcholine binds to its receptor in the sarcolemma of a muscle cell, it triggers an action potential to be generated along the muscle cell membrane. This action potential then spreads along the sarcolemma and eventually leads to muscle contraction by initiating the release of calcium ions from the sarcoplasmic reticulum.
What happens when binding acetylcholine to the chemically gated ion channels on the plasma membrane of the muscle fiber?
When acetylcholine binds to the chemically gated ion channels on the plasma membrane of the muscle fiber, it causes these channels to open, allowing sodium ions to flow into the cell. This influx of sodium ions depolarizes the muscle fiber membrane, generating an action potential. The action potential then triggers the release of calcium ions from the sarcoplasmic reticulum, ultimately leading to muscle contraction.
What are the electrical events conducted along the cell plasma membrane that stimulate contraction?
Action potentials are conducted along the cell plasma membrane, triggering the release of calcium ions from the sarcoplasmic reticulum. The calcium ions then bind to troponin, initiating the sliding of actin and myosin filaments, leading to muscle contraction.
What is the correct sequence of events for muscle contractions?
Muscle contractions begin with an action potential traveling down a motor neuron to the muscle fiber. This signal triggers the release of calcium ions from the sarcoplasmic reticulum, which bind to troponin and initiate the sliding of actin and myosin filaments, leading to muscle contraction. Finally, the muscle relaxes when the calcium ions are pumped back into the sarcoplasmic reticulum.
What would happen if acetylcholine was released into a neuromuscular junction?
It attaches to its receptor, and binds. Causes another action potential, (calcium released) and it goes to the T-tubule of the Sarcoplasmic reticulum, and attaches to troponin, which moves the tropomyosin, so the myosin and actin and attach, and cause a muscle contraction.
When is calcium pumped into the sarcoplasmic reticulum?
When Ach enters the synaptic cleft (gap) it open chemically gated sodium channels that starts an action potential spreading through the sarcolemma of the myofibril. This action potential spreads down the T-tubules and "shocks" the sarcoplasmic reticulum into releasing calcium ions.
What connects the sarcolemma and the sarcoplasmic reticulum?
The T-tubules, or transverse tubules, connect the sarcolemma (muscle cell membrane) to the sarcoplasmic reticulum (membrane network within muscle cells). T-tubules allow for the rapid transmission of action potentials generated at the sarcolemma to the interior of the muscle cell, triggering the release of calcium from the sarcoplasmic reticulum to initiate muscle contraction.
What happens when acetycholine binds to its receptor in the sarcolemma and triggers?
When acetylcholine binds to its receptor in the sarcolemma of a muscle cell, it triggers an action potential to be generated along the muscle cell membrane. This action potential then spreads along the sarcolemma and eventually leads to muscle contraction by initiating the release of calcium ions from the sarcoplasmic reticulum.
What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?
sarcoplasmic reticulum
What is excitation coupling and list the process?
Excitation coupling is the process by which an action potential in a muscle cell triggers the release of calcium ions from the sarcoplasmic reticulum, leading to muscle contraction. The steps of excitation coupling in muscle cells involve depolarization of the cell membrane, activation of voltage-gated calcium channels, release of calcium ions from the sarcoplasmic reticulum, and activation of the contractile proteins within the muscle cell.
Terminal cisternae of the sarcoplasmic reticulum release Ca2 when signaled by the?
Terminal cisternae of the sarcoplasmic reticulum release Ca2+ when signaled by an action potential traveling along the T-tubules. This Ca2+ release triggers muscle contraction by binding to troponin and initiating the sliding of actin and myosin filaments.
What happens when binding acetylcholine to the chemically gated ion channels on the plasma membrane of the muscle fiber?
When acetylcholine binds to the chemically gated ion channels on the plasma membrane of the muscle fiber, it causes these channels to open, allowing sodium ions to flow into the cell. This influx of sodium ions depolarizes the muscle fiber membrane, generating an action potential. The action potential then triggers the release of calcium ions from the sarcoplasmic reticulum, ultimately leading to muscle contraction.
What does sarcoplasmic reticulum do?
The Sarcoplasmic Retiulum releases calcium ions that will cause troponin/tropomyosin complex to move. This exposes the binding sites on actin and allows the cross-bridges of myosin to bind to the actin binding sites.
What does the transverse tubules do?
Transverse tubules are extensions of the cell membrane that help to transmit action potentials deep into the muscle fibers. They allow for the rapid and synchronized release of calcium ions from the sarcoplasmic reticulum to trigger muscle contraction.
The period of a muscle twitch during which an action potential causes the release of calcium from the sarcoplasmic reticulum is the A stimulatory phase B lag phase C relaxation phase D cont?
D- contraction phase
What are the electrical events conducted along the cell plasma membrane that stimulate contraction?
Action potentials are conducted along the cell plasma membrane, triggering the release of calcium ions from the sarcoplasmic reticulum. The calcium ions then bind to troponin, initiating the sliding of actin and myosin filaments, leading to muscle contraction.
What is the correct sequence of events for muscle contractions?
Muscle contractions begin with an action potential traveling down a motor neuron to the muscle fiber. This signal triggers the release of calcium ions from the sarcoplasmic reticulum, which bind to troponin and initiate the sliding of actin and myosin filaments, leading to muscle contraction. Finally, the muscle relaxes when the calcium ions are pumped back into the sarcoplasmic reticulum.
