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neuron
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∙ 12y ago
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What is a T-tubule?
To carry an action potential to the interior of the cell.
The ions that enter the muscle cell during action potential generation are?
cacium ions
A long structure leaving the cell body that action potential travel along is called the?
It is the Axon
B What are the major events of an action potential and what ion changes are associated with each event?
An action potential is a chain reaction of cell events caused by an ionic gradient. One example is the firing of a nerve reaction.
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
Which cell conducts an action potential?
neurons
When the electrical potential in a cell is in action versus a resting state the electrical charge reversal?
Action Potential
Do axons carry action potentials away from the cell body?
The areas that have had the action potential are refractory to a new action potential.
Dendrites conduct both graded and action potential?
no, dendrites and cell bodies can only have graded potential. action potential only occurs in axons
What determines if an action potential is initiated in the postsynaptic neuron?
Every time neurotransmitter is released from the presynaptic neuron it generates an excitatory post synaptic potential(EPSP) in the postsynaptic neuron. When the EPSP is greater than the threshold for excitation an action potential is generated.
What is the electrical signal carried by a nerve cell?
Action potential
What is a T-tubule?
To carry an action potential to the interior of the cell.
An action potential is caused by an influx of these ions into the cell?
sodium ions
In which direction do potassium ions flow as the action potential passes?
Out of the cell
Where does potassium diffuse to after an action potential is propagated?
Out of the cell into the tissue fluid.
What is in the cell membrane that can be opened or close?
There is more potassium inside the cell during a resting period...as an action potential occurs, the cell becomes depolarized, or in other words there is an influx of sodium, allowing the membrane to open. As the action potential comes to an end, the cell repolarizes, meaning the levels of sodium rush outside of the cell again, while the potassium flows back in. As another action potential takes place, this happens over again.
What restores and puts the cell membrane to resting conditions after an action potential?
Calcium
