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When acetylcholine diffuses across syaptic cleft?
Like any other neurotransmitter, acetylcholine will attach itself to active sites on the dendrite, thus triggering the opening of sodium gates of the next neuron. Once that's done, the acetylcholine either breaks down or is absorbed back into the cell it originated from.
The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the?
The signal to excite a muscle cell involves the release of acetylcholine from the motor neuron into the synaptic cleft at the neuromuscular junction. Acetylcholine diffuses across the synaptic cleft and binds to receptors on the muscle cell membrane, leading to depolarization and muscle contraction. This process is crucial for transmitting signals from the nervous system to the muscle for movement.
What is the name of the cell that releases the neurotransmitters?
Exocytosis. As a result of the influx of Calcium ions, the synaptic vesicles transport the neurotransmitter Ach (Acetylcholine) to the presynaptic membrane, the vesicles fuse to the membrane, and the neurotransmiffer, Ach, diffuses. Once the neurotransmitters cross the synaptic cleft, they bind to the receptors on the post synaptic membrane. Hope it helps a bit.
When an electrical impluse travels along a motor neuron and arrives at a neuromuscular junction what happens?
Calcium enters through the voltage-gate and triggers the release of transmitter. " the entry of calcium through voltage-gated calcium channels causes synaptic vesicles to fuse with the presynaptic plasma membrane and release the neurotransmitter acetylcholine into the synaptic cleft. Acetylcholine diffuses across the cleft and binds to muscle acetylcholine receptors, causing depolarization and an action potential that travels throughout the length of the muscle cell triggering muscle contraction. "
When the what reaches the end of the axon the neurotransmitter is released?
When the _____________reaches the ends of the axon the neurotransmitter is released and it diffuses to the muscle cell membrane to combine with receptors there?Sarcolemma
Describe the interaction of acetylcholine and calcium ions in stimulating muscle contraction?
The acetylcholine diffuses across the synapse and binds to and activates nicotinic acetylcholine receptors on the motor end plate of the muscle cell. Activation of the nicotinic receptor opens its intrinsic sodium/potassium channel, causing sodium to rush in and potassium to trickle out.
When acetylcholine diffuses across syaptic cleft?
Like any other neurotransmitter, acetylcholine will attach itself to active sites on the dendrite, thus triggering the opening of sodium gates of the next neuron. Once that's done, the acetylcholine either breaks down or is absorbed back into the cell it originated from.
Contraction mechanism in a skeletal muscle cell?
ACH is released at the end-plate potential. ACH diffuses into the sarcolemma, attaches to the receptors in the motor end plate and causes a change in the ions permeability that creates graded depolarization of the end-plate potential. Basically, it attaches to the receptors in the motor-end plate and creates the beginning process of triggering muscle contractions.
Which of these junctions represents the connection between the tip of a neuron and a skeletal muscle cell from which Acetylcholine diffuses?
Neuromuscular
The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the?
The signal to excite a muscle cell involves the release of acetylcholine from the motor neuron into the synaptic cleft at the neuromuscular junction. Acetylcholine diffuses across the synaptic cleft and binds to receptors on the muscle cell membrane, leading to depolarization and muscle contraction. This process is crucial for transmitting signals from the nervous system to the muscle for movement.
What is the normal sequence of events that occur during synaptic transmission at a motor end plate?
1. Nerve impulse reaches synaptic terminal. 2. Synaptic vesicles move to and merge with the presynaptic cell membrane of the motor neuron. 3. Acetylcholine is released into and diffuses across the synaptic cleft. 4. Acetylcholine binds to receptors on the postsynaptic cell membrane of the muscle fiber.
What reaches the end of the axon when the neurotransmitter is released and diffuses to the muscle membrane to combine with receptors there?
nerve impulse
What is the name of the cell that releases the neurotransmitters?
Exocytosis. As a result of the influx of Calcium ions, the synaptic vesicles transport the neurotransmitter Ach (Acetylcholine) to the presynaptic membrane, the vesicles fuse to the membrane, and the neurotransmiffer, Ach, diffuses. Once the neurotransmitters cross the synaptic cleft, they bind to the receptors on the post synaptic membrane. Hope it helps a bit.
What is the effect of acetylcholine affect sphincter muscles?
During Parasympathetic action when acetlcholine is released in the sphincter muscles then the M3 muscarinic receptors stimulate Gq protein and this in turn activate Phospholipase C (PLC). PLC then cleaves the phospholipid. In the process, phosphatidylinositol 4,5-bisphosphate (PIP2) is cleaved into diacyl glycerol (DAG) and inositol 1,4,5-triphosphate (IP3). DAG remains bound to the membrane and IP3 is released as a soluble structure in the cytosol. IP3 then diffuses through the cytosol to bind to IP3 receptors, particularly the calcium channels in the endoplasmic reticulum (ER). These channels are specific to calcium and allow only the passage of calcium to move through. This causes the cytosolic concentration of calcium to increase and cause the cascade of contractile machinery and the spinchter will contract and tighten up.
When an electrical impluse travels along a motor neuron and arrives at a neuromuscular junction what happens?
Calcium enters through the voltage-gate and triggers the release of transmitter. " the entry of calcium through voltage-gated calcium channels causes synaptic vesicles to fuse with the presynaptic plasma membrane and release the neurotransmitter acetylcholine into the synaptic cleft. Acetylcholine diffuses across the cleft and binds to muscle acetylcholine receptors, causing depolarization and an action potential that travels throughout the length of the muscle cell triggering muscle contraction. "
What Neurotransmitter diffuses across a synapse to a muscle cell?
It varies: In the somatic system (skeletal muscle) and parasympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually acetylcholine. In the sympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually norepinephrine (also called noradrenaline). There are exceptions, but this is the general rule.
When the what reaches the end of the axon the neurotransmitter is released?
When the _____________reaches the ends of the axon the neurotransmitter is released and it diffuses to the muscle cell membrane to combine with receptors there?Sarcolemma
