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Membrane Permeability - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

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Permeability and Types of Membranes
  • Permeability can be defined as the property of a membrane to allow transport of a given substance across it.
  • It depends on:
    • The size of pores in the plasma membrane
    • The size and charge of the molecules of the given substance

Based on the permeability, the membranes can be of following types:

  • Permeable membranes: If a given substance passes readily across the membrane.
  • Impermeable membranes: If a given substance cannot pass through the membrane.
  • Semipermeable membranes: If the membrane allows only water molecules to pass through it and solutes and not allowed at all.
  • Selectively permeable membranes: If the membranes allow some selected solute molecules to pass through it along with water molecules. These are also called differentially permeable membranes. Such membranes operate in the biological systems.

Note: 

  • The semipermeable membranes are used for the operation of osmosis.
  • The selectively permeable membranes are used for the operation of diffusion.
     

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