Describe two examples of diffusion as it occurs in living organisms. Diffusion in living organisms.

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Diffusion or passive transport occurs in living organisms without any additional input of energy. The process simply occurs if the concentration gradient is such that there is a concentration difference of a particular substance outside and inside a cell membrane. The substance must have small enough molecules to fit through the pores in...

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Diffusion or passive transport occurs in living organisms without any additional input of energy. The process simply occurs if the concentration gradient is such that there is a concentration difference of a particular substance outside and inside a cell membrane. The substance must have small enough molecules to fit through the pores in the membrane.  For example, if there is a higher concentration of glucose in the bloodstream,relative to the level inside the body cells, glucose passes through the capillary walls and will diffuse into the cells, from high to low concentration.  Another example would be osmosis, a special type of diffusion that occurs when the substance water passes through a cell membrane. If a cell is surrounded outside, by a high concentration of water relative to the inside of the cell,  as when you water a plant, the water passes into the cell from high concentration outside, to low concentration inside. Eventually, when an equilibrium is established on either side of the membrane, diffusion will stop.

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