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distance involved =diffusion at short distances occurs at a greater rate than diffusion at long distances
area involved= diffusion over short distance occurs at a greater rate than diffusion over long distances
Barriers=thicker barriers slow down rates of diffusion
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∙ 14y ago
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When ions move across a plasma membrane what will happen?
they create a flow of electrical currrent that can disturb the resting membrane potential.
What movement do ion channels aid?
the movement of ions across a cell membrane.
How are diffusion and facilitated diffusion diffrent?
Diffusion directly passes through the cell membrane unaffected by the hydrophobic part of the membrane. Facilitated diffusion uses proteins to assist in the movement of molecules. Ions have trouble moving through the hydrophobic part of the membrane.
What molecules passively diffuse across the plasma membrane?
Diffusion is a type of passive transport but the answer I think you are looking for is this: water, gasses(N,O2,CO2...), and ions(K+, Na+...)
What is FALSE regarding the membrane potential?
Both potassium and sodium ions can "leak" through the cell membrane due to diffusion.
What drives diffusion?
Diffusion is the movement of ions and other micro molecules across a barrier or membrane. Diffusion is caused by gradients on either side of the membrane.
When ions move across a plasma membrane what will happen?
they create a flow of electrical currrent that can disturb the resting membrane potential.
Ions diffuse across membranes down their what?
Its an active transport and use sodium channel generally _____ Diffusion is itself a pathway of travel across a cell membrane. Diffusion can be "simple diffusion" which is simply an ion moving across the membrane anywhere, or "fascilitated diffusion", where an ion moves across the membrane in a specific channel. Either way, diffusion involves the movement of that ion along its concentration gradient and requires no energy. Active transport is not the same as diffusion. Active transport requires energy.
How is facilitated diffusion differing from diffusion?
Simple diffusion allows non-polar molecules to pass through and a little amount of H20. On the other hand, Facilitated diffusion allows ions and polar molecules across the membrane because it contains carrier proteins. It is highly specific to substances it diffuses across the membrane.
How do ions pass through the membrane?
Osmosis and diffusion
Facilitated diffusion sentence?
Facilitated diffusion is a type of diffusion specifically for larger molecules, to help them cross a selectively permeable membrane with the help of integral proteins that act as carriers. Facilitated diffusion is a passive process, i.e. it does not need energy/ATP.
What two forces drive the passive transport of ions across a membrane?
Two forces drive the passive transport of ions across a membrane: -the concentration gradient of the ions -the effect of membrane potential (voltage) on the ions
What is formed when enzymes move hydrogen ions across a membrane to an area of greater concentration?
I will say the answer is osmosis or diffusion...I'll go with osmosis. MC
What movement do ion channels aid?
the movement of ions across a cell membrane.
Diffusion across the cell membrane results in depolarization?
Through a systematic flow of potassium,calcium and sodium ions. Ie. slower acting gates alow timed flow of these ions while a contraction of these cells pushes out ions to restart the resting membrane potiential.
How are diffusion and facilitated diffusion diffrent?
Diffusion directly passes through the cell membrane unaffected by the hydrophobic part of the membrane. Facilitated diffusion uses proteins to assist in the movement of molecules. Ions have trouble moving through the hydrophobic part of the membrane.
What ions can leak through the plasma membrane due to diffusion?
N, P, K and trace element ions
