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If a resting neuron is stimulated and there is an inward flow of positive charges into the cell the membrane potential will?
Huntingp5
move upward away from the resting potential and closer to zero
Wiki User
∙ 15y ago
If a resting neuron is stimulated and there is an inward flow of positive charges into the cell, the membrane potential will depolarize, meaning the inside of the cell becomes less negative. This can trigger an action potential if the depolarization reaches the threshold level.
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Do positive charges tend to move from points of high potential to low potential?
yes
What is it called when positive and negative charges have a potential difference?
Voltage.
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 is a difference in electric charge called?
The chemical gradient refers to the imbalance of substances across the membrane. The Electrical Gradient refers to the difference of charges between substances on different sides of the Membrane. The Electrochemical Gradient refers to the combination of the previous two gradients. The short answer is MEMBRANE POTENTIAL.
What substances plays a mojor role in generating the membrane potential of a neuron?
Well, for starters, membrane potential is a separation of charges across the membrane. So i think what you mean is "generating the action potential in a neuron". So in that case The substance that plays a major role in generating an action potential is Sodium (Na+). However, if you really mean membrane potential, there is only two substances associated with that and those are sodium (Na+) and potassium (K+).However, in truth, the generation of an action potential depends on the ligand and its receptor.
Circle the letter of the choice that describes an action potential?
a. Reversal of charges due to the flow of positive ions into a neuron
Why electric potential is defined on positive charge?
That's just in convention, in line with other electric convention. It is common to use positive charges as a standard; for example, a current is usually defined as a movement of positive charges. If the actual charges happen to be negative (for example, electrons), the "conventional current" simply flows in the direction opposite to the flow of electrons.
Do positive objects contain only positive charges?
No. A positive ion merely has more positive charges (protons) than negative charges (electrons).
What influences the movement of ions and molecules across cell membranes?
A membrane potential is basically the difference between the inside and outside of the cell. Ions are charged, and so will change the membrane potential (the difference between charges on the inside and outside) when they move. Please see the related link below which includes a diagram of how ions affect membrane potential.
Why is the potential energy of two like charges positive and two unlike charges negative?
This is a way of saying that two like charges repel each other and unlike charges attract. Remember that systems tend to 'seek' the lowest energy state possible.
What is the resting potential and how is it created and maintained?
The resting potential is the voltage inside the neuron cell membrane of about -70 mV (negative 70 millivolts). This electrical potential (separation of charges) is made possible by an imbalance in sodium (positive), potassium (positive), and chloride (negative) ions on each side of the neural membrane. In the case of the resting potential, the surplus of chloride ions and relative deficiency of sodium/potassium ions within the neuron, relative to the outside of the neuron, give a charge difference of 70 millivolts, making the inside of the neuron more negative than the outside.There are ion channels that open and close based on voltages and other factors that are embedded in the neuron's cell membrane. When triggered by a nerve impulse, they open to allow for positive ions to stream into the nerve, which depolarizes it to generate the "signal".After the signal passes, the neuron resets itself by opening ion channels that pump positive ions back out of the neuron, and pump negative ions back in, in order to readjust to the resting potential again.
What is the importance and function of cytosol to the brain?
Cytosol is the fluid found inside cells and is the medium where cellular metabolism takes place. It has a slightly different composition to the fluid found outsides cells (extracellular fluid). In neurons, this difference in fluid composition is critical for cell signaling because it creates an electrochemical potential gradient across the cell membrane. When ions flux in and out of the cell (driven by chemical gradients and 'ion pumps') their charge alters the electrical potential difference across the cell membrane (i.e., think of the membrane as an insulator separating positive and negative charges). If enough positive charge enters a neuron then it will fire (release it's neurotransmitters).
