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What would happen to a resting membrane potential if the concentration of a large intracellular anions that are unable to cross the membrane experimentally is increased?
If the concentration of large intracellular anions..i.e. proteins, which are unable to cross the membrane due to their large size.. were to increase, the resting potential would reach a more negative state, a deviation from -70mV to a more negative value do to these anions.
What else can I help you with?
What is the mechanism that restores the resting membrane voltage and intracellular ionic concentration?
Resting membrane potential is restored through the activity of the sodium-potassium pump, which actively transports sodium ions out of the cell and potassium ions into the cell. Intracellular ionic concentration is restored through various ion channels and transporters that regulate the movement of ions across the cell membrane based on concentration gradients.
What does it mean when a concentration level it high?
A high concentration level indicates there is a large amount of a substance present in a given volume. This can have various implications depending on the context, such as increased potency or potential for toxicity.
What effect did increasing the extracellular potassium have on the resting membrane potential?
Increasing the extracellular potassium concentration can depolarize the resting membrane potential, making it less negative. This can lead to increased excitability of the cell.
The chief positive intracellular ion in a resting neuron?
The chief positive intracellular ion in a resting neuron is potassium (K+). At rest, the neuron has a higher concentration of K+ inside its cell membrane compared to outside. This creates a negative membrane potential, which is crucial for maintaining the resting state of the neuron.
Why does the addition of sodium chloride elicit an action potential?
Adding sodium chloride increases the concentration of sodium ions outside of the cell. This means that the concentration gradient is increased even more than what is usually the resting potential and with that as the driving force, a action potential occurs the same way as if the channels opened up from an electropotential.
What effect does the leaking of potassium across the membrane have on the membrane potential of Kevin's neurons?
Leaking of potassium across the membrane will lead to a decrease in the intracellular potassium concentration, causing the neuron to become hyperpolarized (more negative). This will make it more difficult for the neuron to reach threshold and fire an action potential.
Does the cell potential change with concentration variations in a chemical reaction?
Yes, the cell potential can change with concentration variations in a chemical reaction. This is because the concentration of reactants and products can affect the flow of electrons in the cell, which in turn influences the cell potential.
What two physical factors affect water potential?
Pressure and solute concentration are the two physical factors that affect water potential. Pressure increases water potential, while solute concentration decreases water potential.
What is the main intracellular ion?
The main intracellular ion is potassium (K+). It plays a crucial role in many cellular processes including maintaining membrane potential, regulating cell volume, and influencing muscle contractions.
What factors affect water potential?
Water potential is affected by factors such as pressure, solute concentration, and gravity. Pressure can increase water potential (positive pressure potential) while solute concentration and gravity can decrease it (negative solute and gravitational potential). Temperature can also influence water potential by affecting the kinetic energy of water molecules.
What is the potential energy increased by going up hill?
gravitational potential energy
Is concentration gradient a form of potential energy?
Yes, a concentration gradient represents potential energy in the form of chemical potential energy. This energy arises from the difference in concentration of a substance across a membrane, and it can be used to drive processes like diffusion or active transport.
