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What are 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. These specialized synapses facilitate the communication between motor neurons and muscle fibers, enabling muscle contraction. At the neuromuscular junction, neurotransmitters like acetylcholine are released, binding to receptors on the muscle membrane to initiate a response.
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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.
What is a presynaptic neuron?
a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.
When nerve impulses from several presynaptic neurons stimulate a single postsynaptic neuron at the same time it is called?
chemical synapse
What are neurotransmitters for postsynaptic neuron?
Neurotransmitters are chemical messengers that transmit signals and information from the presynaptic neuron to the postsynaptic neuron at the synapse. They bind to receptors on the postsynaptic neuron, leading to changes in its membrane potential and triggering a new signal to be passed along the neural pathway. Some common neurotransmitters include acetylcholine, dopamine, serotonin, and glutamate.
What accomplishes the transmission of the nerve signal across the synapse?
The release of 'neurotransmitter substances' from an axon's perifery which traverse the synaptic cleft - the space between axon and adjoining dendrite - to both affect and effect the adjoining dendritic "perifery" which then re-initiates signal propagation to the next bunch of exonic nerve "endings".
What is a junction or point of close contact between neuron?
A junction or point of close contact between neurons is called a synapse. It is where electrical or chemical signals are transmitted from one neuron to another. Neurotransmitters are released from the presynaptic neuron to the postsynaptic neuron to carry out this communication.
What is a presynaptic terminal?
A presynaptic terminal is the part of a neuron that releases neurotransmitters into the synaptic cleft during neurotransmission. Located at the end of an axon, it contains synaptic vesicles filled with these chemical messengers. When an action potential reaches the presynaptic terminal, it triggers the release of neurotransmitters, which then bind to receptors on the postsynaptic neuron, facilitating communication between neurons. This process is essential for the functioning of the nervous system.
What is the space between neurons across which chemical messages pass?
The space between neurons is called the synaptic cleft. It is where neurotransmitters are released by the presynaptic neuron, travel across the cleft, and bind to receptors on the postsynaptic neuron to transmit chemical messages.
How does an impulse travel from a presynaptic neuron to a postsynaptic neuron?
When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.
Why conduction at synapses is always one-way?
There are two basic reasons. One is that chemical transmission only affects the side in the synapse that have specific receptors for the neurotransmitter released, secondly the presynaptic terminal has been depolarized and is in it's refractory period, where it can not again fire. This is also the reason why the travelling wave of the action potential only travels from the axon hillock where the AP is generated towards the nerve terminal. There is, however, one caveat to this 'rule'. In the CA1 region of the hippocampus there is a retrograde signal from the postsynaptic neuron back to the presynaptic side using the gas NO as the 'transmitter'.
What bridges the gap between a neuron sending a message and the neuron receiving it?
Neurotransmitters are chemical messengers that bridge the gap, known as the synaptic cleft, between a neuron sending a message (presynaptic neuron) and the neuron receiving it (postsynaptic neuron). These neurotransmitters are released from the presynaptic neuron in response to an electrical signal and bind to receptors on the postsynaptic neuron, causing changes in its electrical activity.
How does electrical impulses move through the synapse gap?
Electrical impulses, or action potentials, do not directly move across the synaptic gap; instead, they trigger the release of neurotransmitters from the presynaptic neuron into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic neuron, leading to changes in the postsynaptic membrane potential. This process converts the electrical signal into a chemical signal and back into an electrical signal, allowing communication between neurons.
