Cell membrane permeabilit

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KyleH123
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#1
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Hi all! This was homework but it's been done now. I was able to explain the 4 types of transport through a cell membrane, those being

Active transport
Facilitated diffusion
Simple diffusion
Osmosis

Could someone say a few examples of molecules that are able to pass the membrane through these transport types and why they need this type?

It isn't homework. We've already been over this topic.
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KyleH123
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anyone
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typicalvirgo
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(Original post by KyleH123)
Hi all! This was homework but it's been done now. I was able to explain the 4 types of transport through a cell membrane, those being

Active transport
Facilitated diffusion
Simple diffusion
Osmosis

Could someone say a few examples of molecules that are able to pass the membrane through these transport types and why they need this type?

It isn't homework. We've already been over this topic.
1. your profile picture is terrifying.
Ok, onto the actual help.

Active transport is the movement of substances from a low conc. to a high conc. against its conc. gradient using ATP. Examples of this include Na+ and K+ in a sodium potassium pump. These can be found in the nephron, if you're interested.

Facilitated diffusion occurs when substances are moved from a high conc. to a low conc. down its conc. gradient with the help of a co transport or carrier protein. It is a passive process and an example is in the nephron, where a Na+, amino acid and glucose pump is used during selective reabsorption.

Simple diffusion is the movement of substances from a high conc. to a low conc. down its conc. gradient. It is also passive and an example is non polar molecules like oxygen and carbon dioxide diffusing directly through the phospholipid bilayer.

Osmosis only refers to the movement of water from a high water potential to a low water potential, down its water potential gradient, ie through a plant cellulose cell wall, if the plant is in a purer solution of course.
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KyleH123
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(Original post by typicalvirgo)
1. your profile picture is terrifying.
Ok, onto the actual help.

Active transport is the movement of substances from a low conc. to a high conc. against its conc. gradient using ATP. Examples of this include Na+ and K+ in a sodium potassium pump. These can be found in the nephron, if you're interested.

Facilitated diffusion occurs when substances are moved from a high conc. to a low conc. down its conc. gradient with the help of a co transport or carrier protein. It is a passive process and an example is in the nephron, where a Na+, amino acid and glucose pump is used during selective reabsorption.

Simple diffusion is the movement of substances from a high conc. to a low conc. down its conc. gradient. It is also passive and an example is non polar molecules like oxygen and carbon dioxide diffusing directly through the phospholipid bilayer.

Osmosis only refers to the movement of water from a high water potential to a low water potential, down its water potential gradient, ie through a plant cellulose cell wall, if the plant is in a purer solution of course.


Thanks a lot : - )
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