Transport in cells- diffusion

• Diffusion


  Movement of particles from an area of HIGH to LOW concentration
• Diffusion


  • No energy required
• Diffusion in the small intestine


  Particles move in the digested food (e.g. glucose, amino acids) from digested food in small intestine to blood in capillary of villus
• Diffusion in the lungs


  Particles move in the oxygen from alveolar air space to blood circulating around the lungs
• Diffusion in the kidneys


  Particles move in the urea from cells to blood plasma