Cell Transport

• Lung Adaptations: (many) alveoli which provide a large(r) surface area (: volume)

  • capillaries are thin or alveoli / capillary walls are thin or one cell thick or capillaries are close to the alveoli which provides short diffusion path (for oxygen / carbon dioxide)

  • breathing (mechanism) moves air in and out or lungs are ventilated to bring in (fresh) oxygen and to remove carbon dioxide

  • large capillary network (around alveoli) or good blood supply to remove oxygen(ated blood) quickly and to bring carbon dioxide to the lungs quickly
• OSMOSIS USES A PARTIALLY PERMEABLE MEMBRANE
• Osmosis is the movement of water molecules from an area of high concentration to low concentration through a partially permeable membrane.
• Diffusion is the net movement of particles down their concentration gradient, from areas of higher concentration to lower concentration until equilibrium is reached.