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A neuron that is excited to subthreshold is said to be?
A neuron that is excited to subthreshold is said to be depolarized. This means that the neuron's membrane potential has become less negative, bringing it closer to the threshold potential needed to generate an action potential.
Organelle that required large number of cells whose membrane often depolarized?
Muscle cells contain organelles called mitochondria that require a large number of cells to produce energy through the process of cellular respiration. During muscle contraction, the membrane of the mitochondria can become depolarized as part of the energy production process.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
What word means a possibility that hasn't become real yet?
Potential.
Does the neuron respond to all impulses?
Yes a neuron will always respond to the binding of neurotransmitters released from another cell (synaptic transmission being the 'impulse'). Depending on which neurotransmitter was bound, the postsynaptic potential of the membrane will become either more positive or more negative. It is the summation of these inputs and membrane potentials that determine whether the cell will subsequently fire an action potential.
A neuron that is excited to subthreshold is said to be?
A neuron that is excited to subthreshold is said to be depolarized. This means that the neuron's membrane potential has become less negative, bringing it closer to the threshold potential needed to generate an action potential.
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 one reason for gradual behavioral recovery from brain damage?
Postsynaptic cells deprived of input become supersensitive.
What initiates the depolarization of the neuron?
Most neurons are at a negative membrane potential so when a ligand operated channel opens there is an inflow of positively charged ions, mostly but not exclusively sodium. If the neuron cell membrane has voltage-operated channels (the textbook example) then the inflow of positive ions can open the voltage-operated channels causing an even greater flow of positive ions into the neuron. This positive feed arrangement can lead to the neuron transitioning from negative to respect to outside of the cell to positive (overshoot). Since the voltage-operated channels inactive and also due to the potassium specific channels the cell is returned it's pre-action potential negative level (close to potassium's equilibrium potential).
Organelle that required large number of cells whose membrane often depolarized?
Muscle cells contain organelles called mitochondria that require a large number of cells to produce energy through the process of cellular respiration. During muscle contraction, the membrane of the mitochondria can become depolarized as part of the energy production process.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
What makes sure that there is one action potential in the neuromuscular junction for one action potential in the muscle?
After a neuron fires, there is a refractory period where certain factors in the neuron prevent it from being depolarized again. This is made possible by an "overshoot" of polarization (returning to a much stronger negative ion charge inside the neuron) after the action potential passes. This ensures that voltage-controlled ion channels remain closed for a small period of time and do not become overactive through continuous restimulation.
What does Asystoli mean?
Asystole is when the heart has stopped long enough to become depolarized. At this time, it may be time to consider pronouncing death as even electrical shocks would most likely be useless. By the time Asystole sets in, the brain has gone a good 20-45 minutes without oxygen. Asystole is when the heart has stopped long enough to become depolarized. At this time, it may be time to consider pronouncing death as even electrical shocks would most likely be useless. By the time Asystole sets in, the brain has gone a good 20-45 minutes without oxygen.
What evolutionary stage a star become a dwarf?
after the star dies it has the potential to become a dwarf
How can you reach your potential in theatre?
become chuck norris
How do you use the word potential to make sentences?
She has a lot of potential to become what she wants to be. Potential energy is one type of energy. A tornado watch means there is potential for a tornado.
Is 'potential problem' is a correct phrase?
Yes, the term means that something has the potential to become a problem. The word 'potential' can be a noun or an adjective. In this term, the word 'potential' is an adjective describing the noun 'problem'.
