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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.
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∙ 8y ago
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What happens if the permeability of a resting axon to sodium ion increases?
inward movement of sodium will increase and the membrane will depolarize.
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 is soil permeability?
soil permeability is the amount of water soil can hold
Can a rock have high porosity but low permeability?
Yes for example Clay has high porosity and low permeability
What rock is low in porosity and low in permeability?
Most intrusive igneous rock is low in porosity and permeability.
What feature of a membrane describes whether molecules can cross the membrane?
permeabiity
What are facts about permeability?
Changes in permeability are changes in the number of compounds that can pass through a membrane. The presence of certain chemicals or radiation can change the permeability of a membrane.
What is the ability of a cell membrane to allow material to pass through it called?
permeability
Which feature of a membrane describes molecules whether can cross the membrane?
permeability
Which molecule of a membrane describes whether molecules 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.
What is the permeability of the cell membranes?
A membrane is selectively permeable.
What membrane allows materials to pass into and out of the cell?
Permeability
How does the permeability of the plasma membrane relate to homeostasis?
who the knows
Selective permeability refers to the fact that the plasma membrane keeps all molecules out of the cell?
Selective permeability refers to the fact that the plasma membrane can choose which molecules to let in or out of the cell.
What part of the membrane indicates how easy it is for substances to cross?
Permeability
What causes increased permeability of the endothelial-capsular membrane?
Histamines
