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Transporting cells (Key Facts (Concentration gradient (A measurament of…
Transporting cells
Diffusion
Def of Diffusion- Diffusion is the process that particles of a high concentration (hypertonic) to a lower concentration (hypotonic) erywere except water. (This process does not require Energy.)
Example of Diffusion- You can smell perfume because it diffuses into the air and makes its way into your nose.
Diffusion in the lungs.
When we breathe in we take air that is relatively high in oxygen into our lungs. When in the individual alveoli in our lungs, that air is one tiny membrane away from our blood, which has low concentration of oxygen than in the air . So the oxygen naturally diffuses from inside the alveoli into the blood. Because the blood in our body is always moving (Pumped by the heart) the blood that now has a higher concentration of oxygen is immediately moved away from the tissues and organs and is replaced by 'NEW' blood with lower levels of
oxygen.
Key Facts
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Semi-permeable
(of a material or membrane) allowing certain substances to pass through it but not others, especially allowing the passage of a solvent but not of certain solutes
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Protein chambers
Protein chambers are passages that are situated in the cell membranes, these are used to let in and out particles.
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Osmosis
Def of Osmosis- Osmosis is the process that particles of a high concentration (hypertonic) to a lower concentration (hypotonic) in water, This process does not require Energy.
Active transport
Def of Active transport- As you know, Diffusion and Osmosis are about particles from a higher concentration moving to a lower concentration of particles and it does not require energy.
But Active transport is complitly the other way round, Active transport consists when particles of a lower concentration moves to a higher concentration and it does require enrgy for this particles to work.