2. Facilitated Diffusion PASSIVE TRANSPORT 3 Types 1. Diffusion 2. Facilitated Diffusion 3. Osmosis

1. Diffusion molecules from a high concentration to low concentration Molecules want to reach equilibrium No ATP required Diffusion Video

What kind of particles diffuse through the Plasma Membrane? Oxygen, glucose, and carbon dioxide diffuse through the membrane

3 Factors that effect the rate of Diffusion 1. Concentration 2.Temperature 3. Pressure Makes diffusion happen faster

If we had heated up this water, would the food coloring have diffused faster?

Concentration Gradient The difference in concentration is the concentration gradient

2. Facilitated Diffusion Still goes from HIGH to LOW “helps” a molecule go through the membrane EX: Transport Protein EX: Making coffee Facilitated Diffusion

Comparing the 2 Types of Diffusion

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Osmosis The diffusion of WATER across a semi- permeable membrane high concentration to a low concentration of water

Osmosis To be different from diffusion, Osmosis needs 2 things: 1) Water 2) Semi-permeable Membrane THE MOVEMENT OF WATER

Hint: the sugar isn’t moving across What happened? Hint: the sugar isn’t moving across

Osmosis There is a higher concentration of “DOTS” on one side, so a LOWER concentration of WATER The DOTS equal a solute

3 kinds of Osmotic Solutions 1) Isotonic 2) Hypertonic 3) Hypotonic

Isotonic Equal amount of water inside and outside the cell EX: Saline solution for contact lenses

Hypertonic Greater concentration of water inside the cell than outside the cell Water leaves the cell to reach equilibrium EX: When your fingers get wrinkled in the shower

HypOtonic Greater concentration outside the cell, than inside the cell Water moves into the cell

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