What happens as a result of ion flow at a presynaptic terminal? Synaptic vesicles migrate to the plasma membrane and release acetylcholine. Acetylcholine is passively transported from the presynaptic neuron. Acetylcholine is actively transported to the postsynaptic neuron. Ligand-gated sodium channels open. Sodium ions diffuse into the cell.
Added by Jared A.
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Step 1: Action potential travels through the membrane of the presynaptic cell, causing calcium channels to open. Show more…
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After acetylcholine crosses the synaptic cleft and binds to the acetylcholine receptor, the very next step that occurs at the neuromuscular junction is the opening of calcium channels in the sarcolemma. This allows calcium to rush into the muscle cell, causing the interior of the sarcolemma to go from negative to positive. Calcium is then released by the sarcoplasmic reticulum and binds to troponin, resulting in muscle contraction. Additionally, sodium pumps in the sarcolemma are activated, causing sodium to rush into the muscle cell and further changing the interior of the sarcolemma from positive to negative. Finally, sodium channels in the sarcolemma open, allowing sodium to rush into the muscle cell and causing the interior of the sarcolemma to go from negative to positive.
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The arrival of an action potential at the nerve terminal causes release of neurotransmitter from the presynaptic membrane. The release of neurotransmitters from the presynaptic membrane is triggered by hyperpolarization of the presynaptic membrane. an excitatory ligand binding to receptors on the presynaptic membrane. release of Ca++ from the endoplasmic reticulum in the nerve terminal. opening of voltage-gated Ca++ channels in the plasma membrane.
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An influx of Na+ ions occurs at the axon terminal. Voltage-gated Ca2+ channels open, resulting in an influx of Ca2+. Synaptic vesicles fuse with the plasma membrane. Neurotransmitters arrive at the dendrites of the postsynaptic neuron. Neurotransmitters alter the permeability of the postsynaptic membrane to ions. In what order do the events above occur in Neuron Synapse?
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