0
What else can I help you with?
The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?
Calcium ions in muscle cells are primarily stored in the sarcoplasmic reticulum, a specialized form of the endoplasmic reticulum. When an action potential travels along the muscle cell membrane, it triggers the release of calcium ions from the sarcoplasmic reticulum into the cytoplasm. This influx of calcium ions initiates the contraction process by enabling the interaction between actin and myosin filaments.
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 lateral sacs of the sarcoplasmic reticulum called?
The lateral sacs of the sarcoplasmic reticulum are called terminal cisternae. These structures are enlarged regions of the sarcoplasmic reticulum that store calcium ions and play a crucial role in muscle contraction by releasing calcium in response to action potentials. They are typically located adjacent to the T-tubules in muscle fibers.
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.
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.
The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?
Calcium ions in muscle cells are primarily stored in the sarcoplasmic reticulum, a specialized form of the endoplasmic reticulum. When an action potential travels along the muscle cell membrane, it triggers the release of calcium ions from the sarcoplasmic reticulum into the cytoplasm. This influx of calcium ions initiates the contraction process by enabling the interaction between actin and myosin filaments.
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 are the lateral sacs of the sarcoplasmic reticulum called?
The lateral sacs of the sarcoplasmic reticulum are called terminal cisternae. These structures are enlarged regions of the sarcoplasmic reticulum that store calcium ions and play a crucial role in muscle contraction by releasing calcium in response to action potentials. They are typically located adjacent to the T-tubules in muscle fibers.
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.
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.
