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If the concentration of sodium is higher outside of the cell compared to inside how does it get out of the cell again following the action potential 18?
After an action potential, sodium ions (Na⁺) that entered the cell during depolarization must be removed to restore the resting membrane potential. This is primarily achieved through the action of the sodium-potassium pump (Na⁺/K⁺ ATPase), which actively transports sodium ions out of the cell while bringing potassium ions (K⁺) in. This process requires ATP and helps maintain the necessary concentration gradients for proper cell function. Additionally, passive diffusion through sodium channels can also play a minor role in this process.
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How does the inside of the resting neuron compare to the outside in terms of electrical charge and Na plus concentration?
The concentration of negatively charged proteins and positively charged potassium ions, K+, is greater inside the cell than outside. In contrast, the concentration of sodium ions, Na+, is greater outside the cell than inside. The concentrations of Na+ and K+ ions are partly due to the action of the sodium-potassium pump, which actively moves Na+ out of cells while moving K+ in.
What best describes the Na and K concentrations across a neuron's plasma membrane?
The Na concentration is higher outside of the neuron's plasma membrane, while the K concentration is higher inside the neuron's plasma membrane. This creates an electrochemical gradient that allows for the generation and transmission of electrical signals in neurons.
What best describes the Na plus and K plus concentrations across a neuron's plasma membrane?
Na+ concentration is higher outside the neuron than inside, while K+ concentration is higher inside the neuron than outside. This concentration gradient is maintained by the Na+/K+ pump, which actively transports Na+ out of the cell and K+ into the cell, contributing to the resting membrane potential of the neuron.
What is an example of a concentration gradient?
An example of a concentration gradient is the difference in the concentration of ions inside and outside a cell membrane. This difference creates an electrical potential that drives processes such as ion transport and nerve cell signaling.
What is hysotonic?
"Hypotonic" refers to a solution that has a lower concentration of solutes compared to another solution. In biology, a hypotonic solution has a lower concentration of solutes outside of a cell compared to inside, causing water to move into the cell and potentially cause it to swell and burst.
What is exomosis?
Exosmosis is the movement of water molecules out of a cell or organism due to the higher solute concentration outside compared to inside. This process can lead to dehydration and potential cell damage if not properly regulated.
How does the inside of the resting neuron compare to the outside in terms of electrical charge and Na plus concentration?
The concentration of negatively charged proteins and positively charged potassium ions, K+, is greater inside the cell than outside. In contrast, the concentration of sodium ions, Na+, is greater outside the cell than inside. The concentrations of Na+ and K+ ions are partly due to the action of the sodium-potassium pump, which actively moves Na+ out of cells while moving K+ in.
Is the solution in the hypotonic state transitioning from a low concentration to a high concentration?
No, in a hypotonic solution, the solute concentration is lower outside the cell compared to inside the cell, so the transition is from a high concentration to a low concentration.
Is resting potential caused by a difference in the concentration of certain ions inside and outside the cell?
True
What best describes the Na and K concentrations across a neuron's plasma membrane?
The Na concentration is higher outside of the neuron's plasma membrane, while the K concentration is higher inside the neuron's plasma membrane. This creates an electrochemical gradient that allows for the generation and transmission of electrical signals in neurons.
The concentration of material is greater on the outside of the cell than the inside in what solution?
The concentration of material is greater on the outside of the cell than the inside in a hypertonic solution. In this solution, there is a higher concentration of solutes outside the cell compared to inside, causing water to move out of the cell, leading to cell shrinkage.
What best describes the Na plus and K plus concentrations across a neuron's plasma membrane?
Na+ concentration is higher outside the neuron than inside, while K+ concentration is higher inside the neuron than outside. This concentration gradient is maintained by the Na+/K+ pump, which actively transports Na+ out of the cell and K+ into the cell, contributing to the resting membrane potential of the neuron.
The inside of cells have a higher concentration of what?
The inside of cells have a higher concentration of potassium ions compared to the outside of the cell. This concentration gradient is maintained through the action of ion channels and pumps in the cell membrane.
Is the baggie or beaker hypertonic?
It depends on the concentration of solutes inside and outside the baggie or beaker. If the concentration of solutes is higher inside the baggie or beaker compared to the surrounding environment, then it is hypertonic. If the concentration is lower, then it is hypotonic.
What is the concentration of sodium in a neuron?
The concentration of sodium inside a neuron is lower than outside due to the activity of the sodium-potassium pump. Specifically, the concentration of sodium ions is higher outside the neuron at around 145mM, compared to around 10-15mM inside the neuron.
What causes the inside of a neuron to be negative?
The inside of a neuron is negative due to a higher concentration of negatively charged ions, particularly chloride and proteins, compared to the outside of the neuron. This difference in ion concentration creates a resting membrane potential, which is maintained by the sodium-potassium pump and ion channels in the neuron's cell membrane.
What is an example of a concentration gradient?
An example of a concentration gradient is the difference in the concentration of ions inside and outside a cell membrane. This difference creates an electrical potential that drives processes such as ion transport and nerve cell signaling.
