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Is the The resting membrane potential is mainly determined by the concentration gradient of K plus inside the cell?
Beatchica
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In diffiusion movement of particles across a membrane is drven by what differences?
In diffusion, the movement of particles across a membrane is driven by an electrochemical gradient-the ion's concentration gradient and the membrane potential. Substances will passively diffuse down their concentration gradient to where they are less concentrated. Since the inside of a cell is negative compared to its outside, the membrane potential will drive the passive transport of cations into the cell and anions out of the cell due to electrostatic attractions.
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 Hyperpolarizing membrane potential occurs in the postsynaptic membrane of a synapse?
Hyperpolarization means that the membrane potential becames more negative than the resting potential. This means that it is more difficult for an action potential to be triggered at the postsynaptic membrane. This occurs at inhibitory synapses. Hyperpolarization can be achieved by increasing the permeability of the membrane to potassium or chloride ions. If potassium permeability is increased more potassium ions will leave the cell, down their concentration gradient; if chloride permeability increases chloride ions will enter the cell down their concentration gradient. Both movements will make the inside of the cell more negative ie they will cause hyperpolarization.
When there are different amounts of a substance on either side of the cell membrane an gradient results?
osmosis
What is is required for diffusion to occur?
A concentration gradient and a (semi-)permeable membrane.
What is an example of diffusion in a sentence?
The rate of diffusion is determined by the permeability of the membrane and the concentration gradient.
Is concentration gradient a form of potential energy?
w hen solute concentrations differ on the two sides of a membrane
Which term describes the difference in the concentration of a substance across a cells membrane?
concentration gradient
In diffiusion movement of particles across a membrane is drven by what differences?
In diffusion, the movement of particles across a membrane is driven by an electrochemical gradient-the ion's concentration gradient and the membrane potential. Substances will passively diffuse down their concentration gradient to where they are less concentrated. Since the inside of a cell is negative compared to its outside, the membrane potential will drive the passive transport of cations into the cell and anions out of the cell due to electrostatic attractions.
What factors contribute to the membrane potential of a cell?
There are many factors that contribute to the membrane potential of a cell. The driving force of ions which are a summation of voltage gradient and concentration gradient are an important one. Also other proteins and amino acids contribute to the cell's membrane potential.
What would happen to the resting membrane potential of a neuron if sodium were allowed to travel freely down its concentration gradient?
The cell will depolarise
The transport of a substance across the cell membrane against its concentration gradient is called what?
The transport of a substance across the cell membrane against its concentration gradient is called active transport.
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 does concentration gradient have to do with diffusion of substances across the cell membrane?
concentration gradient moves from high to low until equilibrium is reached.
What is the osmosis definition?
"Osmosis is the diffusion of a solvent (frequently water) through a semi-permeable membrane, from a solution of low solute concentration (high water potential) to a solution with high solute concentration (low water potential), up a solute concentration gradient."
What two forces drive the passive transport of ions across a membrane?
Two forces drive the passive transport of ions across a membrane: -the concentration gradient of the ions -the effect of membrane potential (voltage) on the ions
What regulates the rate of passive transport?
the concentration gradient and the membrane
