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Which of the following statements concerning the permeability of a typical nerve cell membrane at rest is true?
The nerve membrane is freely permeable to potassium, although there is a Na+/K+ ATPase that pumps 3 Na+ in and 2 K+ out.
The resting potential is around -60mV to -70mV
The driving force of Na+ is inwards, as is Cl- and Ca2+, while the driving force of K+ faces outwards.
K+ wants to go down its concentration gradient (there is more K+ in the cell than out of the cell).
Na+ wants to go down its concentration and electrical gradient (it's more negative inside the cell and there's less Na+ there).
The permeability of a cell is determined by the number of channels it has, the length the channels are open, and the conductivity of each channel to a particular ion.
The Nernst potential for Na+ is +65, while it is around -95 for K+.
What else can I help you with?
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 feature of a membrane describes whether molecules can cross the membrane?
permeabiity
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
Which one of the following statements about phospholipids is least accurate?
Phospholipids are only found in the cell membrane.
Does an increase in cholesterol affect membrane permeability?
Yes, an increase in cholesterol can affect membrane permeability by making the cell membrane less fluid and more rigid, which can impact the movement of molecules in and out of the cell.
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 feature of a membrane describes whether molecules can cross the membrane?
permeabiity
What is the ability of a cell membrane to allow material to pass through it called?
permeability
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 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
Which one of the following statements about phospholipids is least accurate?
Phospholipids are only found in the cell membrane.
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
Does an increase in cholesterol affect membrane permeability?
Yes, an increase in cholesterol can affect membrane permeability by making the cell membrane less fluid and more rigid, which can impact the movement of molecules in and out of the cell.
What are facts about permeability?
Permeability refers to the ability of a material to allow fluids or gases to pass through it. It is influenced by factors such as the size of the pores in the material, the composition of the material, and the pressure applied. Permeability is an important property in various fields such as geology, engineering, and biology.
