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Sodium ions (Na⁺) are the primary ion that depolarizes the membrane when they diffuse into the axon of a neuron. During an action potential, voltage-gated sodium channels open in response to a threshold stimulus, allowing Na⁺ to flow into the cell. This influx of positively charged sodium ions reduces the negative charge inside the neuron, leading to depolarization and the propagation of the nerve impulse.
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Which part of the neuron can propagate an action potential?
The axon is the part of the neuron that can propagate an action potential. This process relies on the opening and closing of ion channels along the axon membrane to allow the action potential to travel from the cell body to the axon terminals.
What part of the neuron can conduct an action potential?
The axon of a neuron is responsible for conducting an action potential. This is made possible by the presence of voltage-gated ion channels along the axon membrane that allow for the propagation of electrical signals.
When neuron is sufficiently stimulated this process starts the movement of ions across the axon membrane?
When a neuron is sufficiently stimulated, voltage-gated ion channels open along the axon membrane, allowing positively charged ions, such as sodium, to flow into the cell. This creates an electrical impulse called an action potential that propagates along the axon. The movement of ions is essential for transmitting the signal along the neuron.
What portion of a neuron forms the presynaptic neuronal membrane?
The axon terminals of a neuron form the presynaptic neuronal membrane. These structures contain synaptic vesicles that store neurotransmitters for release at the synapse.
A charge difference between the interior of the neuron axon and the exterior exists when the neuron is?
When the neuron is at rest, a charge difference known as the resting membrane potential exists between the interior and exterior of the axon. This potential is maintained by the unequal distribution of ions across the cell membrane, with more negative ions inside the cell compared to the outside.
What is a axon hillock?
An axon hillock is a special cell body that connects an axon to a neuron. It is the last place where propagated membrane potentials are transmitted to the axon.
The first voltage-regulated gates encountered along the neuron membrane which initiate the formation of action potentials are located on the neuron near the?
axon hillock
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
When the blank reaches the ends of the axon the neurotransmitter is released and diffuses to the muscle cell membrane?
Synaptic vesicle
Which part of the neuron can propagate an action potential?
The axon is the part of the neuron that can propagate an action potential. This process relies on the opening and closing of ion channels along the axon membrane to allow the action potential to travel from the cell body to the axon terminals.
What part of the neuron can conduct an action potential?
The axon of a neuron is responsible for conducting an action potential. This is made possible by the presence of voltage-gated ion channels along the axon membrane that allow for the propagation of electrical signals.
When neuron is sufficiently stimulated this process starts the movement of ions across the axon membrane?
When a neuron is sufficiently stimulated, voltage-gated ion channels open along the axon membrane, allowing positively charged ions, such as sodium, to flow into the cell. This creates an electrical impulse called an action potential that propagates along the axon. The movement of ions is essential for transmitting the signal along the neuron.
What events occur in a neuron between the stimulus of a nerve and the stimulation of its target cell?
When a nerve is stimulated, its cell membrane is depolarised so that the inside of the cell becomes less negative. The potential is conducted along the axon to the axon terminal. At the dendrite it stimulates the release of a chemical transmitter, which diffuses across a synapse. The transmitter binds to receptor sites on the postsynaptic cell membrane to stimulate the generation of another impulse.
What portion of a neuron forms the presynaptic neuronal membrane?
The axon terminals of a neuron form the presynaptic neuronal membrane. These structures contain synaptic vesicles that store neurotransmitters for release at the synapse.
A charge difference between the interior of the neuron axon and the exterior exists when the neuron is?
When the neuron is at rest, a charge difference known as the resting membrane potential exists between the interior and exterior of the axon. This potential is maintained by the unequal distribution of ions across the cell membrane, with more negative ions inside the cell compared to the outside.
What separates axon terminals?
The synaptic cleft, a small gap filled with extracellular fluid, separates axon terminals from the postsynaptic membrane of the neighboring neuron. This separation allows for the release of neurotransmitters from the axon terminal to signal the next neuron.
What is the name of the tiny gap the neurotransmitter has to diffuse across to reach the membrane of the postsynaptic neuron?
The tiny gap that the neurotransmitter has to diffuse across to reach the membrane of the postsynaptic neuron is called the synaptic cleft. It separates the axon terminal of the presynaptic neuron from the dendrite of the postsynaptic neuron.
