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Presynaptic nerve impulses trigger the release of neurotransmitters from synaptic vesicles at the axon terminal into the synaptic cleft. These neurotransmitters then bind to specific receptors on the postsynaptic membrane, leading to changes in the postsynaptic neuron's membrane potential. If the change is sufficient to reach the threshold, an action potential is generated in the postsynaptic neuron, allowing the signal to continue propagating. This process facilitates communication between neurons in the nervous system.
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When nerve impulses from several presynaptic neurons stimulate a single postsynaptic neuron at the same time it is called?
chemical synapse
What is the route followed by nerve impulses when one neuron communicates with another?
When one neuron communicates with another, the nerve impulse travels down the axon of the presynaptic neuron, reaches the axon terminal, triggers the release of neurotransmitters into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic neuron's dendrites, initiating a new nerve impulse in the postsynaptic neuron.
What is in the dendrites of the postsynaptic nerve?
Dendrites of a postsynaptic nerve contain receptors for neurotransmitters released by the presynaptic neuron. These receptors detect and respond to the neurotransmitters by initiating an electrical signal that travels towards the cell body. This signal determines whether the neuron will fire an action potential.
Where are synaptic nodes?
Synaptic nodes, also known as synapses, are found at the junctions between neurons, where communication occurs. They are located on the axon terminals of the presynaptic neuron and the dendrites or cell body of the postsynaptic neuron. These nodes facilitate the transmission of signals through the release and reception of neurotransmitters, allowing for the propagation of nerve impulses.
What is an example of a presynaptic cell?
An example of a presynaptic cell is a neuron that releases neurotransmitters into the synaptic cleft to communicate with the postsynaptic cell.
When nerve impulses from several presynaptic neurons stimulate a single postsynaptic neuron at the same time it is called?
chemical synapse
What is the difference between presynaptic and postsynaptic neurons?
Presynaptic neurons release the neurotransmitter in response to an action potential. Postsynaptic neurons receive the neurotransmitter (and can however become presynaptic to the next nerve cell, if the neurotransmitter has stimulated the cell enough).
What is the route followed by nerve impulses when one neuron communicates with another?
When one neuron communicates with another, the nerve impulse travels down the axon of the presynaptic neuron, reaches the axon terminal, triggers the release of neurotransmitters into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic neuron's dendrites, initiating a new nerve impulse in the postsynaptic neuron.
What is it when nerve impulses are interrupted and muscles don't react?
This can be caused by inhibitor molecules known as neurotoxins occupying the active sites of the receptor molecules of the postsynaptic neurone membrane, this prevents an action potential from being carried from the presynaptic neurone to the postsynaptic neurone, thus preventing the passage of a nerve impulse and consequental muscular contractions that produce an effect to stimuli
What is in the dendrites of the postsynaptic nerve?
Dendrites of a postsynaptic nerve contain receptors for neurotransmitters released by the presynaptic neuron. These receptors detect and respond to the neurotransmitters by initiating an electrical signal that travels towards the cell body. This signal determines whether the neuron will fire an action potential.
What is the difference between presynaptic and postsynaptic neurons in the context of synaptic transmission?
Presynaptic neurons send signals, while postsynaptic neurons receive signals in synaptic transmission. Presynaptic neurons release neurotransmitters that travel across the synapse to bind to receptors on postsynaptic neurons, triggering a response.
Where are synaptic nodes?
Synaptic nodes, also known as synapses, are found at the junctions between neurons, where communication occurs. They are located on the axon terminals of the presynaptic neuron and the dendrites or cell body of the postsynaptic neuron. These nodes facilitate the transmission of signals through the release and reception of neurotransmitters, allowing for the propagation of nerve impulses.
What is an example of a presynaptic cell?
An example of a presynaptic cell is a neuron that releases neurotransmitters into the synaptic cleft to communicate with the postsynaptic cell.
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called?
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called neuromuscular junctions. At these junctions, the neurotransmitter acetylcholine is released from the presynaptic terminal and binds to receptors on the postsynaptic membrane, initiating muscle contraction.
Which neural circuit enables a single presynaptic stimulation to cause a postsynaptic cell to send a series of impulses?
Reverberating neural circuits are responsible for generating a series of action potentials in a postsynaptic cell in response to a single presynaptic stimulation. This circuit involves positive feedback loops where excitation from the original stimulation is amplified and sustained through recurrent connections within the network.
Where are the receptors for neurotransmitters located?
Neurotransmitter receptors are located on the postsynaptic membrane of neurons. When a neurotransmitter binds to its specific receptor, it can either excite or inhibit the postsynaptic neuron, thereby influencing the transmission of signals in the brain.
Which presynaptic cell must have action potentials to produce one or more action potentials in the postsynaptic cell?
The presynaptic cell that must have action potentials to produce one or more action potentials in the postsynaptic cell is the neuron releasing neurotransmitters at the synapse. When an action potential reaches the presynaptic terminal, it triggers the release of neurotransmitters into the synaptic cleft, which then bind to receptors on the postsynaptic cell membrane, leading to the generation of an action potential in the postsynaptic cell.
