An example of the use of interrupted sutures after removal of palatal bony exostosis. A, A smallpalatal exostosis thatinterferes withproperdenture constructioninthisarea.B,Acrestal incision and mucoperios-teal ï¬ap reï¬ection to expose the palatal exostosis. C, Use of a bone ï¬le to remove bony excess.
A: Facilitated diffusion differs from simple diffusion in that it crosses a membrane with the aid of passive transport proteins embedded in the membrane. Both types of diffusion are the movement of particles in solution from areas of higher concentration to areas of lower concentration.
Facilitated Diffusion Diffusion is the flow of chemicals and other substances to a region of low concentration from a region of high concentration. Certain small nonpolar substances, such as oxygen, can diffuse directly through the membrane in a process called simple diffusion. Large, polar or charged molecules and ions either cannot squeeze through the small membrane spaces or are repelled by the hydrophobic membrane interior.