Viewing 15 reply threads
  • Author
    Posts
    • #3282
      Mr.Smoke
      Participant

      Dear Friends,
      what is passive transport in cell and how they work.

    • #37855
      victor
      Participant

      Passive transport : transport ‘something’ done by cells without consuming ATP.
      How they work? ahh…come on man..there’re so many things to write then….

    • #37871
      bearhug
      Participant

      Just think of as if you were swimming down a stream. It would be passive transport because it does not take much energy for you to go down with current. Facilitated diffusion is a form of passive transport, when something hydrophilic needs to go down a concentration gradient in a phospholipid bilayer it uses a transport protein to help it, since inside the bilayer is hydrophobic. This is like you using a kayak to go down a stream. Active transport would be like you trying to swim against the current.

    • #37880
      Mr.Smoke
      Participant

      thanks

    • #37918
      sdekivit
      Participant

      passive transport is transport down a concentration – or electrochemical gradient.

    • #37975
      Mr.Smoke
      Participant

      ya offcourse! passive transport is the transportation of electrolyte present in cell, from higher to lower concentration and it do no need any energy….. but i wants to know its example and mechanism

    • #37977
      victor
      Participant

      Example: diffusion of water molecule into the cell inside a hypotonic solution (that’s the most simple one..:lol:)

    • #37978
      victor
      Participant

      Example: diffusion of water molecule into the cell inside a hypotonic solution (that’s the most simple one..:lol:)

    • #37984
      Enzyme
      Participant

      The passive transport is a process of diffusion of molecules through the membrane. It is always produced in favour of gradient. Types of passive transport:

      – Simple diffusion: Little molecules pass in favour of gradient but they can pass literally through the lipidic bilayer or by canal proteins. Examples: Transport of lipidic molecules (as steroidic hormones), anaesthetics as ether, liposoluble chemicals, apolar substances (as atmospheric oxygen and nitrogen) and some polar molecules (as carbon dioxide, ethanol, glycerin, etc). Also water pass by simple diffusion (it pass by canal proteins called aquoporines) by osmosis.

      – Simple diffusion by regulated canal proteins: It is carried out by regulated canal proteins. Of this form, ions (as Na+, K+, Ca2+ and Cl-) come into the cell. Regulated canal proteins are proteins with a hole or internal canal which its opening is regulated by molecular signals (hormones, neurotransmissors, etc). The molecular signal joins to a certain region of the cell (its specific receptor) to activate the opening of the canal. When the molecular signal is joined with the receptor, the receptor suffers a structural change and the canal is opened.

      – Facilitated diffusion: It allows the transport of little polar molecules as amino acids, monosaccharides, etc. As they can’t pass through the lipidic bilayer, they require transmembranal proteins to pass into the cell. These transmembranal proteins are called permeases. When the molecule which is going to be transported joins to the permease, this protein suffers a conformational change and the molecule is pulled along into the cell.

    • #37985
      Enzyme
      Participant

      1. Simple diffusion (literally through the lipidic bilayer).
      2. Simple diffusion (by canal proteins).
      3. Facilitated diffusion.
      4. Active transport.


      Attachments:

    • #37986
      Enzyme
      Participant

      Two diagrams about simple difussion by regulated canal proteins.


      Attachments:

    • #37997
      Mr.Smoke
      Participant

      Thanks Alot Enzyme

    • #38015
      Enzyme
      Participant
      quote Mr.Smoke:

      Thanks Alot Enzyme

      You’re welcome ;).

    • #38280
      Dr.Stein
      Participant

      Aww somebody took my job 🙁 I think I don’t need to supply figure(s) anymore 🙄 😆

    • #41867
      Enzyme
      Participant
      quote Dr.Stein:

      Aww somebody took my job 🙁 I think I don’t need to supply figure(s) anymore 🙄 😆

      Sorry…
      😕 😥 😆 😆

    • #107272
      biologypro
      Participant

      Very easy. Passive transport is the movement of materials without using the cell’s energy. Some examples would be osmosis, diffusion, and facilitated diffusion. Hope this helps.

Viewing 15 reply threads
  • You must be logged in to reply to this topic.