Join TSR now and get all your revision questions answeredSign up now

Cell membrane permeabilit

    • Thread Starter
    Offline

    3
    ReputationRep:
    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.
    • Thread Starter
    Offline

    3
    ReputationRep:
    anyone
    Offline

    3
    ReputationRep:
    (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.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (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 : - )
 
 
 
Write a reply… Reply
Submit reply
Updated: October 2, 2016
Poll
Which party will you be voting for in the General Election 2017?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.