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When the outside of the neuron cell is more positive than the inside the cell is?
When the outside of the neuron cell is more positive than the inside, the cell is in a state of depolarization. This shift in electrical charge can trigger an action potential, leading to the propagation of nerve impulses along the neuron.
What cell structure is used to prepare for depolarization?
The cell structure used to prepare for depolarization is the sodium-potassium pump, which actively transports sodium out of the cell and potassium into the cell to establish the necessary concentration gradients for depolarization to occur.
In a typical neuron sheaths of fatty tissue are called?
In a typical neuron, sheaths of fatty tissue are called the Myelin sheath. The myelin sheath surrounds parts of the axon of a nerve cell which speeds up neurotransmitters.
What ion is responsible for depolarization of hair cells of the spiral organ?
The potassium ion is responsible for depolarization of hair cells in the spiral organ. When deflected, potassium channels open, leading to an influx of potassium ions into the cell and depolarization of the cell membrane.
What cell membrane do action potentials travel along?
The membrane or resting potential is the difference in voltage within and outside the cell when that cell is at rest. In a typical neuron it is usually around -65mV, meaning the neuron is negatively charged relative to the extracellular space. This potential is due to various ions and the permeability of the neuronal membrane. When a neuron gets a signal from another neuron, this causes the concentration of various ions to change (some flow in, others out of, the cell). In some cases, the signal causes positive ions to flow into the cell, making the membrane potential less negative. Once it reaches a threshold, usually around -55mV, the cell "fires" or makes an action potential, which is when the membrane potential temporarily shoots up to around +40mV. This signal propagates down the length of the neuron and then passes that message on to other cells.
Depolarization involves a neuron becoming?
Depolarization involves a neuron's cell membrane potential becoming less negative, moving closer to zero. This occurs when positively charged ions flow into the cell, usually through ion channels, leading to an excitatory response in the neuron.
What does a neuron cell contain?
A typical neuron consists of a cell body (soma), dendrites, and an axon.
What does it mean when a cell is depolarized?
Depolarization refers to the reversal of charges of neuron cell membrane, it occurs by moving in of 'Na' ions .
How is the resting potential different from repolarization?
The resting potential is the stable membrane potential of a cell at rest, typically around -70mV. Repolarization refers to the return of the membrane potential to its resting value after depolarization, where the cell becomes more negative again due to potassium channels opening.
What happens when sodium enters a neuron?
When sodium enters a neuron, it triggers depolarization of the cell membrane, which leads to an action potential being generated. This action potential then travels along the neuron, allowing for communication between different neurons or between a neuron and a muscle cell. Sodium influx is a key step in the process of nerve signal transmission.
When the outside of the neuron cell is more positive than the inside the cell is?
When the outside of the neuron cell is more positive than the inside, the cell is in a state of depolarization. This shift in electrical charge can trigger an action potential, leading to the propagation of nerve impulses along the neuron.
What is the rapid change in a membreanes potential cause by the depolarization of a neuron?
The rapid change in membrane potential caused by the depolarization of a neuron is known as an action potential. During depolarization, voltage-gated sodium channels open, allowing sodium ions to flow into the cell, causing the inside of the neuron to become more positive. This shift in charge initiates the action potential, which is essential for the transmission of electrical signals along the neuron.
A wave of depolarization moves down the neuron?
A wave of depolarization occurs when there is a sudden influx of positive ions, typically sodium ions, into the neuron, leading to a reversal of the cell's membrane potential. This helps in transmitting electrical signals along the neuron through a process known as action potential propagation.
Is the largest part of a typical neuron the cell body?
cell body XD
Is depolarization in the heart passed cell to cell in the same way they are the neuromuscular junction?
No, depolarization in the heart is not passed cell to cell in the same way as at the neuromuscular junction. In the heart, gap junctions allow for direct electrical coupling between adjacent cardiac muscle cells, allowing the depolarization signal to quickly spread from cell to cell. In the neuromuscular junction, depolarization is transmitted by the release of neurotransmitters across the synaptic cleft from a neuron to a muscle cell.
What is inside a polarized neuron?
There is electrical potential difference between out side of the cell and inside of the cell, in case of the polarized neuron. This electrical difference is lost in case of depolarization. That is what can be said roughly.
A neuron starts to fire an impulse by the influx of what ions?
A neuron fires an impulse by the influx of sodium ions into the cell. This creates a temporary change in the neuron's membrane potential, leading to depolarization and the generation of an action potential.
