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When a resting neuron's membrane depolarizes, it becomes more positive due to an influx of positively charged ions like sodium. This change in membrane potential triggers an action potential, leading to the propagation of electrical signals along the neuron.
Stimulus A will depolarize a neuron just barely above the threshold. Stimulus B depolarizes a neuron to 10 mV beyond the threshold.
When this occurs, the membranes potenial drops, as potassium and sodium diffuse with their gradient.
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Which cells cause resting membrane potentials to continually depolarize?
Cells with unstable resting membrane potentials, such as pacemaker cells in the heart or neurons in the brain, can continually depolarize due to the presence of a "funny" current (If) that slowly depolarizes the cell until it reaches the threshold for an action potential to be generated.
The resting membrane potential in neurons ranges from?
-65 to -70 millivolts.
What is the inside charge of a nerve at its resting potentail?
The inside of a nerve cell is negatively charged at its resting potential, typically around -70 millivolts. This resting membrane potential is maintained by the differential distribution of ions across the cell membrane, with more sodium and calcium ions outside the cell and more potassium ions inside.
What does the difference in the K and Na concentration on either side of the plasma membrane and permeability of the membrane to those ions generate?
The difference in concentration of K+ and Na+ across the plasma membrane, along with the membrane's permeability to these ions, generates the resting membrane potential. This potential is essential for maintaining electrical excitability in cells, such as neurons and muscle cells, and is involved in processes like nerve signaling and muscle contraction.
What characterizes repolarization the second phase of the action potential?
Repolarization is the phase in which the cell membrane potential returns to its resting state after depolarization. This is driven by the efflux of potassium ions, resulting in the membrane potential becoming more negative. Repolarization is essential for the heart to reset and prepare for the next action potential.
Which cells cause resting membrane potentials to continually depolarize?
Cells with unstable resting membrane potentials, such as pacemaker cells in the heart or neurons in the brain, can continually depolarize due to the presence of a "funny" current (If) that slowly depolarizes the cell until it reaches the threshold for an action potential to be generated.
The resting membrane potential in neurons ranges from?
-65 to -70 millivolts.
Does the sodium or potassium pump provide energy for neurons but does not affect resting membrane potential?
False
What is the inside charge of a nerve at its resting potentail?
The inside of a nerve cell is negatively charged at its resting potential, typically around -70 millivolts. This resting membrane potential is maintained by the differential distribution of ions across the cell membrane, with more sodium and calcium ions outside the cell and more potassium ions inside.
What is an unstimulated neuron?
An unstimulated neuron is a nerve cell that is not currently transmitting signals. It is in a resting state, with a stable membrane potential, and is not actively firing action potentials or sending messages to other neurons.
What does the difference in the K and Na concentration on either side of the plasma membrane and permeability of the membrane to those ions generate?
The difference in concentration of K+ and Na+ across the plasma membrane, along with the membrane's permeability to these ions, generates the resting membrane potential. This potential is essential for maintaining electrical excitability in cells, such as neurons and muscle cells, and is involved in processes like nerve signaling and muscle contraction.
What characterizes repolarization the second phase of the action potential?
Repolarization is the phase in which the cell membrane potential returns to its resting state after depolarization. This is driven by the efflux of potassium ions, resulting in the membrane potential becoming more negative. Repolarization is essential for the heart to reset and prepare for the next action potential.
Why is the resting membrane potential the same value in both the sensory neuron and the interneuron?
The resting membrane potential is typically around -70mV in both sensory neurons and interneurons due to the presence of ion channels that maintain this voltage by allowing specific ions to flow in and out of the cell. This stable membrane potential allows for rapid and efficient communication between different types of neurons in the nervous system.
What is the value for the resting membrane potential for most neurons?
The resting membrane potential for most neurons is around -70 millivolts. This negative charge inside the cell compared to the outside is maintained by the unequal distribution of ions across the cell membrane, with higher concentrations of potassium ions inside the cell and sodium ions outside.
Does all body cells exhibit a resting membrane potential in their resting state therefore making all cells polarized?
No, not all cells exhibit a resting membrane potential. Resting membrane potential is typically seen in excitable cells like neurons and muscle cells due to the unequal distribution of ions across the cell membrane. Other cell types may not show this characteristic polarization.
What characterize repolarization the second phase of the action potential?
Repolarization is the phase in which the cell's membrane potential returns to its resting state after depolarization. This is achieved through the efflux of potassium ions from the cell, restoring the negative internal charge. Repolarization is essential for maintaining the cell's ability to generate subsequent action potentials.
What system keeps the neuron at it's resting potential?
The sodium-potassium pump maintains the neuron's resting membrane potential by actively pumping sodium ions out of the cell and potassium ions into the cell, creating a negative internal charge. This helps to establish the typical resting potential of -70mV in neurons.
