_____ 5. When damage is not too severe, the surface epithelium migrates beneath the dry scab & across the surface of the granulation tissue. This repair process is called proliferation. _____ 6. If tissue damage is very severe, tissue repair is more likely to occur by fibrosis or scarring. _____ 7. During fibrosis, fibroblasts in the granulation tissue lay down keratin fibers, which form a strong, compact but inflexible mass. _____ 8. The repair of cardiac muscle & nervous tissue occurs only by fibrosis. II. Indentify structural parts & characteristics of all 4 tissue types, their locations & functions. Example Questions. 1.