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When a resting nerve fiber is polarized sodium and potassium ions is higher on the inside of its membrane?
A resting nerve fiber is polarized because the concentration ofNa+ is higher on the outside and K+ is higher on the inside.
What does polarized mean when a nerve cell is polarized?
When a nerve cell is polarized, it means that there is a difference in electrical charge across its membrane, with the inside of the cell being negatively charged relative to the outside. This polarization is primarily due to the distribution of ions, such as sodium and potassium, maintained by ion channels and pumps. This resting potential is essential for the nerve cell's ability to transmit electrical signals, as it allows for rapid changes in charge that occur during action potentials.
When a nerve fiber is polarized the concentration is what?
When a nerve fiber is polarized, the concentration of sodium ions is higher outside the cell, while the concentration of potassium ions is higher inside the cell. This concentration gradient helps maintain the resting potential of the neuron.
What is a nerve membrane at rest called?
At rest, the nerve membrane is referred to as polarized, meaning there is a difference in electrical charge between the inside and outside of the cell. This difference is maintained by the sodium-potassium pump, which actively transports ions across the cell membrane.
How is a resting potential achieved in the nervous system?
The resting nerve cell is not being stimulated to send a nerve impulse
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.
When an axon is not conducting a nerve impulse and there is more sodium outside the axon and more potassium inside the axon it is referred to as what?
When an axon is not conducting a nerve impulse and there is a higher concentration of sodium ions outside the axon and a higher concentration of potassium ions inside, it is referred to as the resting potential. During this state, the axon's membrane is polarized, with a negative charge inside relative to the outside. This resting potential is crucial for the generation of action potentials when the neuron becomes activated.
What ion determines the resting membrane potential of nerve and muscle?
The potassium ion (K+) plays a major role in determining the resting membrane potential of nerve and muscle cells. This is because these cells have a higher permeability to potassium ions than other ions, such as sodium ions. As a result, the movement of potassium ions out of the cell through potassium leak channels leads to the establishment and maintenance of the negative resting membrane potential.
When a nerve is at its resting potential the inside charge is?
-70 millivolts.
What most of life of nerve and muscle cells has in what stage?
Nerve and muscle cells primarily function in the resting stage, where they maintain a stable membrane potential, allowing them to respond to stimuli. In nerve cells, this resting state is crucial for the generation and propagation of action potentials, enabling communication. For muscle cells, the resting stage prepares them for contraction when stimulated. Both cell types rely on ion gradients and membrane permeability to sustain their resting potentials.
Parasympathetic innervation of the stomach is provided by?
Parasympathetic innervation of the stomach is provided by the vagus nerve. The vagus nerve is located in the brain and is also known as the pneumogastric nerve.
What is the difference between a nerve cell at the end of repolarization and a nerve cell in the resting state?
At the end of repolarization, a nerve cell has returned to a more negative internal membrane potential after depolarization, but the ion channels are still in the process of resetting. In contrast, in the resting state, the nerve cell has a stable resting membrane potential (typically around -70 mV) with closed voltage-gated channels and the sodium-potassium pump actively maintaining the concentration gradients of sodium and potassium ions. Essentially, the end of repolarization is a transitional phase, while the resting state is a stable condition.
