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What is membrane permeability?
Membrane permeability refers to the ability of molecules, substances, etc. to pass through the membrane. For example, the cell membrane is referred to as 'semi-permeable' because it allows some molecules (such as water) to enter, and stops other molecules (such as sodium ions) from passing through the membrane. If these want to get into the cell, they must then rely on proteins in the cell membrane to let them in.
Which is true of drugs that decrease membrane permeability to sodium ions?
It would decrease the probability of generating a nerve impulse. When a neuron is activiated by a threshold stimulus, the membrane briefly becomes more permeable to sodium. If the permeability is decreased, it will be more difficult for the sodium ions to rush into the cell.
What factors affect the diffusion of water?
One of the factors that affect the diffusion of water through a membrane by osmosis is the permeability of the membrane. The amount of water on each side of the membrane may also have an effect on water's diffusion. Water will diffuse to the side with little water to even out the concentration.
What happens if the permeability of a resting axon to sodium ion increases?
If the permeability of a resting axon to sodium ion increases, it would lead to depolarization of the neuron. This would cause sodium ions to enter the cell, making the inside more positive and potentially triggering an action potential.
Why is the plasma membrane more permeable to potassium ions than sodium ions?
Some substances, including sodium and potassium, use a process called active transport to permeate cell walls. Active transport is controlled by other body systems. It limits the quantity of these substances passing through the plasma membrane to match the needs of the body.
Improper functioning of what might lead to poor regulation of membrane permeability?
platelets
Improper functioning or regulation of what might lead to poor regulation of membrane permeability?
plateletsplateletes"The following" means the list after the question.There is no list following this question.Fibrinogenalbumin fibrinogen platelets lymphocytes chloride ion levelsalbluminplatelets
What feature of a membrane describes whether molecules can cross the membrane?
permeabiity
What controls what passes in and out of cells?
Cell membranes control what passes in and out of cells. They are selectively permeable, meaning they allow certain substances to enter or exit the cell while blocking others. This regulation helps maintain the internal environment of the cell and ensures proper functioning.
Why is the passing into and out of a cell tHROUGH the cell membrane important?
The cell membrane controls what enters and exits the cell, allowing essential nutrients to come in and waste products to be expelled. This selective permeability maintains the cell's internal environment and ensures proper functioning. Without this regulation, the cell would not be able to survive or function properly.
What is the ability of a cell membrane to allow material to pass through it called?
permeability
Which of the following factors does not affect membrane permeability?
The presence of membrane proteins does not directly affect membrane permeability. Membrane proteins mainly play a role in transport, signaling, and cell recognition rather than impacting the permeability of the membrane itself.
What are the units used to measure membrane permeability?
The units used to measure membrane permeability are typically expressed in terms of permeability coefficient, which is measured in cm/s or m/s.
What can you conclude the permeability of the egg membrane?
The permeability of the egg membrane can be inferred based on the substances that can pass through it. For instance, if certain molecules or ions are able to cross the membrane easily, the permeability is high. Conversely, if only specific molecules can pass through, the permeability is more restricted.
Which molecule of a membrane describes whether molecules can cross the membrane?
permeability
Which feature of a membrane describes molecules whether can cross the membrane?
permeability
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
