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Which electrolyte flows into the cell to initiate depolarization?
potassium The answer of potassium is dead wrong. Sodium is the electrolyte that flows into the cell to initiate depolarization. Potassium flows into the cell during repolarization.
What molecules cause polarization and depolarization?
In excitable cells such as neurons and muscle cells, the movement of ions across the cell membrane causes polarization and depolarization. Specifically, during polarization, the cell interior becomes more negative due to the influx of potassium ions. In contrast, depolarization involves the influx of sodium ions, leading to a reversal of the membrane potential towards a more positive charge.
Is depolarization in the heart passed cell to cell in the same way they are the neuromuscular junction?
No, depolarization in the heart is not passed cell to cell in the same way as at the neuromuscular junction. In the heart, gap junctions allow for direct electrical coupling between adjacent cardiac muscle cells, allowing the depolarization signal to quickly spread from cell to cell. In the neuromuscular junction, depolarization is transmitted by the release of neurotransmitters across the synaptic cleft from a neuron to a muscle cell.
What is the first step for nerve impulse generation?
The first step for nerve impulse generation is the depolarization of the cell membrane, which is triggered by a stimulus. This depolarization causes a change in the electrical charge of the cell membrane, leading to the opening of ion channels and the initiation of an action potential.
What is depolarization of the sarcolemma?
Depolarization of the sarcolemma is the process where there is a change in the electrical charge across the cell membrane of a muscle cell. This change in charge helps to propagate an action potential along the cell membrane, initiating muscle contraction.
Which electrolyte flows into the cell to initiate depolarization?
potassium The answer of potassium is dead wrong. Sodium is the electrolyte that flows into the cell to initiate depolarization. Potassium flows into the cell during repolarization.
How is depolarization in a hair cell different from depolarization in a typical neuron?
Depolarization in a hair cell is triggered by mechanical stimulation, such as sound waves or movement, while depolarization in a typical neuron is triggered by chemical signals.
Is depolarization the same as contraction in the heart?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell.
What molecules cause polarization and depolarization?
In excitable cells such as neurons and muscle cells, the movement of ions across the cell membrane causes polarization and depolarization. Specifically, during polarization, the cell interior becomes more negative due to the influx of potassium ions. In contrast, depolarization involves the influx of sodium ions, leading to a reversal of the membrane potential towards a more positive charge.
Nerve impulse consists of a wave of moving away from a point of stimulation?
Nerve impulses are electrical signals that travel along the length of a nerve cell. These signals are initiated by the movement of ions across the cell membrane, creating a wave of depolarization that propagates down the length of the nerve fiber. This depolarization causes the nerve cell to fire, transmitting the signal to other cells.
What causes rapid depolarization phase of a pacemaker cell?
Rapid depolarization happens after the membrane threshold has been reached and Na+ ions start to flow into the cell. As more Na+ ions flood in the cell becomes more and more positive. This causes the voltage gated Na+ channels to open creating a flood of Na+ ions and thus a rapid phase of depolarization. Shortly after this rapid phase K+ ions are released from the cell causing the cell to become more negative closing the Na+ channels and thus repolarizing the cell.
The interior of the cell becomes less negative due to an influx of sodium ions?
The influx of sodium ions causes depolarization of the cell membrane, making the interior less negative. This depolarization can trigger the opening of voltage-gated ion channels, leading to the propagation of an action potential. Sodium-potassium pumps work to restore the original ion concentrations, repolarizing the cell.
What cell structure is used to prepare for depolarization?
The cell structure used to prepare for depolarization is the sodium-potassium pump, which actively transports sodium out of the cell and potassium into the cell to establish the necessary concentration gradients for depolarization to occur.
Describe the action of depolarization and repolarization?
Depolarization is the process where the membrane potential becomes less negative, moving towards zero or even becoming positive. This occurs when sodium ions rush into the cell. Repolarization is the return of the membrane potential back to its resting state, following depolarization, usually through the efflux of potassium ions from the cell.
Is depolarization in the heart passed cell to cell in the same way they are the neuromuscular junction?
No, depolarization in the heart is not passed cell to cell in the same way as at the neuromuscular junction. In the heart, gap junctions allow for direct electrical coupling between adjacent cardiac muscle cells, allowing the depolarization signal to quickly spread from cell to cell. In the neuromuscular junction, depolarization is transmitted by the release of neurotransmitters across the synaptic cleft from a neuron to a muscle cell.
How does the nerve impulse cause contraction of the muscle?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell. Depolarization triggers the release of calcium ions from the sarcoplasmic reticulum inside the muscle cell. In the presence of ATP, the high calcium level causes the myosin heads to bend, dragging actin filaments towards the middle of the unit of contraction.
What is the first step for nerve impulse generation?
The first step for nerve impulse generation is the depolarization of the cell membrane, which is triggered by a stimulus. This depolarization causes a change in the electrical charge of the cell membrane, leading to the opening of ion channels and the initiation of an action potential.
