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How is it possible for ions to be at equilibrium across a plasma membrane and yet not be at the same concentration on both sides?
- a)Because the mobility of ions is restricted across the plasma membrane
- b)Because there is a charge difference across the plasma membrane
- c)Because of voltage-gated ion channels in the plasma membrane
- d)Because of the presence of leak ion channels in the plasma membrane
Correct answer is option 'B'. Can you explain this answer?
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How is it possible for ions to be at equilibrium across a plasma membr...
It is possible for ions to be at equilibrium across a plasma membrane and yet not be at the same concentration on both sides because there is a charge difference across the plasma membrane.
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How is it possible for ions to be at equilibrium across a plasma membr...
Explanation:
The plasma membrane of a cell is selectively permeable, meaning that it allows certain substances to pass through while restricting the movement of others. This selective permeability is crucial for maintaining the equilibrium of ions across the membrane.
Charge Difference:
One of the main reasons ions can be at equilibrium across the plasma membrane but not at the same concentration on both sides is because of a charge difference across the membrane. The plasma membrane is electrically polarized, with a negative charge on the inside and a positive charge on the outside. This charge difference is maintained by the activity of various ion pumps and ion channels in the membrane.
Ion Pumps:
Ion pumps actively transport ions across the membrane, creating and maintaining the charge difference. For example, the sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell. This creates a higher concentration of sodium ions outside the cell and a higher concentration of potassium ions inside the cell.
Ion Channels:
Ion channels, on the other hand, are passive channels that allow ions to pass through the membrane. There are different types of ion channels, including voltage-gated channels and leak channels.
Voltage-gated Ion Channels:
Voltage-gated ion channels open and close in response to changes in membrane potential. They play a crucial role in generating and propagating action potentials in excitable cells, such as neurons and muscle cells. These channels allow specific ions, such as sodium, potassium, and calcium, to flow across the membrane in response to changes in voltage.
Leak Ion Channels:
Leak ion channels, also known as non-gated ion channels, are always open and allow a small amount of ions to pass through the membrane. They contribute to the resting membrane potential and help maintain the equilibrium of ions across the membrane.
Conclusion:
In summary, the presence of a charge difference across the plasma membrane, maintained by ion pumps and ion channels, allows ions to be at equilibrium but not at the same concentration on both sides. This selective permeability is crucial for various cellular processes, such as the transmission of nerve impulses and the maintenance of osmotic balance.
The plasma membrane of a cell is selectively permeable, meaning that it allows certain substances to pass through while restricting the movement of others. This selective permeability is crucial for maintaining the equilibrium of ions across the membrane.
Charge Difference:
One of the main reasons ions can be at equilibrium across the plasma membrane but not at the same concentration on both sides is because of a charge difference across the membrane. The plasma membrane is electrically polarized, with a negative charge on the inside and a positive charge on the outside. This charge difference is maintained by the activity of various ion pumps and ion channels in the membrane.
Ion Pumps:
Ion pumps actively transport ions across the membrane, creating and maintaining the charge difference. For example, the sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell. This creates a higher concentration of sodium ions outside the cell and a higher concentration of potassium ions inside the cell.
Ion Channels:
Ion channels, on the other hand, are passive channels that allow ions to pass through the membrane. There are different types of ion channels, including voltage-gated channels and leak channels.
Voltage-gated Ion Channels:
Voltage-gated ion channels open and close in response to changes in membrane potential. They play a crucial role in generating and propagating action potentials in excitable cells, such as neurons and muscle cells. These channels allow specific ions, such as sodium, potassium, and calcium, to flow across the membrane in response to changes in voltage.
Leak Ion Channels:
Leak ion channels, also known as non-gated ion channels, are always open and allow a small amount of ions to pass through the membrane. They contribute to the resting membrane potential and help maintain the equilibrium of ions across the membrane.
Conclusion:
In summary, the presence of a charge difference across the plasma membrane, maintained by ion pumps and ion channels, allows ions to be at equilibrium but not at the same concentration on both sides. This selective permeability is crucial for various cellular processes, such as the transmission of nerve impulses and the maintenance of osmotic balance.
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How is it possible for ions to be at equilibrium across a plasma membrane and yet not be at the same concentration on both sides?a)Because the mobility of ions is restricted across the plasma membraneb)Because there is a charge difference across the plasma membranec)Because of voltage-gated ion channels in the plasma membraned)Because of the presence of leak ion channels in the plasma membraneCorrect answer is option 'B'. Can you explain this answer?
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