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Cell transport

Passive and active transport across cell membranes:-

Substances can enter or leave a cell in 2 ways:

1) Passive

a) Simple Diffusion
b) Facilitated Diffusion
c) Osmosis (water only)

2) Active

a) Molecules
b) Particles


I. Passive transport across cell membranes

1. Diffusion 
  • Molecules and ions move freely in gases and liquids, each type of these particles tends to spread out evenly within the space available. This is diffusion.
  • Diffusion is:
          + the net movement of molecules
          +  from a region of its higher concentration to a region of its lower concentration. 
          + down a concentration gradient
          + no energy is used.
    Source: northlandcollege.edu

    • Some molecules and ions are able to pass through cell membranes --> The membrane is permeable. Some substances cannot pass through cell membranes --> The membrane is partially permeable.

    Passive and active transport across cell membranes

    Substances can enter or leave a cell in 2 ways:

    1) Passive

    a) Simple Diffusion
    b) Facilitated Diffusion
    c) Osmosis (water only)

    2) Active

    a) Molecules
    b) Particles


    I. Passive transport across cell membranes

    1. Diffusion 
    • Molecules and ions move freely in gases and liquids, each type of these particles tends to spread out evenly within the space available. This is diffusion.
    • Diffusion is:
              + the net movement of molecules
              +  from a region of its higher concentration to a region of its lower concentration. 
              + down a concentration gradient
              + no energy is used.
      Source: northlandcollege.edu

      • Some molecules and ions are able to pass through cell membranes --> The membrane is permeable. Some substances cannot pass through cell membranes --> The membrane is partially permeable.

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