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  1. Simple diffusion and passive transport (article) | Khan Academy

    In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space.

  2. Passive transport and active transport across a cell membrane article

    Simple diffusion is pretty much exactly what it sounds like – molecules move down their gradients through the membrane. Molecules that practice simple diffusion must be small and nonpolar*, in …

  3. Homeostasis and cellular transport (article) | Khan Academy

    There are two main categories of passive transport: simple diffusion (sometimes called “diffusion”) and facilitated diffusion. Both types of passive transport involve substances moving across the cell …

  4. Passive transport review (article) | Khan Academy

    Water passes through the membrane in a diffusion process called osmosis. During active transport, energy is expended to assist material movement across the membrane in a direction against their …

  5. Active transport review (article) | Khan Academy

    Facilitated diffusion is a type of passive transport and along the gradient. Think of a pipe connecting a full tank of water to an empty one. Active transport is against the gradient. Think of a pump moving …

  6. Diffusion (video) | Culture | Khan Academy

    Diffusion is the global spread of ideas, inventions, or discoveries. It can happen through exploration, military conquest, missionary work, mass media, tourism, and the internet.

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  8. Diffusion and osmosis (video) | Khan Academy

    Diffusion refers to the movement of molecules from an area of high concentration to an area of lower concentration. Osmosis is a type of diffusion specifically for water molecules moving across a semi …

  9. Osmosis: what is osmosis? (video) | Khan Academy

    The kind of famous things like slugs will not do well in the presence of salt because the water inside the slug will do exactly what is happening in this diagram.

  10. Introduction to passive and active transport - Khan Academy

    passive transport moves small molecules without the use of energy. there are three kinds of passive transport. diffusion, osmosis (or water diffusion) and facilitated diffusion ( or diffusion with a protien …