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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 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.
What is depolorization?
Depolarization refers to a change in the electrical charge within a cell where the inside of the cell becomes less negative compared to the outside. In the context of neurons, depolarization is a key step in generating an action potential, which is essential for transmitting electrical signals along the nerve cell.
Which electrolyte flows into the cell to initiate depolarization?
Sodium (Na+) is the electrolyte that flows into the cell to initiate depolarization during an action potential. This influx of sodium ions changes the membrane potential, leading to the generation of an action potential.
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.
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.
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 ion is responsible for depolarization of hair cells of the spiral organ?
The potassium ion is responsible for depolarization of hair cells in the spiral organ. When deflected, potassium channels open, leading to an influx of potassium ions into the cell and depolarization of the cell membrane.
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.
What is depolorization?
Depolarization refers to a change in the electrical charge within a cell where the inside of the cell becomes less negative compared to the outside. In the context of neurons, depolarization is a key step in generating an action potential, which is essential for transmitting electrical signals along the nerve cell.
Which electrolyte flows into the cell to initiate depolarization?
Sodium (Na+) is the electrolyte that flows into the cell to initiate depolarization during an action potential. This influx of sodium ions changes the membrane potential, leading to the generation of an action potential.
Define the term depolarization?
Depolarization is a term used in biology. It is the change in or loss of polarity or polarization in a cell by removing some of the negative charges.
What are the major positive electrolytes responsible for depolarization?
The major positive electrolytes responsible for depolarization of a cell are sodium (Na+) and calcium (Ca2+). These ions enter the cell during the depolarization phase of an action potential, leading to a change in membrane potential and initiation of an electrical signal.
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.
What ion is released within the myocardial cell with the depolarization and acts on the contractile proteins causing the cell to contract?
myosin?
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.
