Constitutive Defenses Barriers to entry See Schaechter text table 6.1 Mucous membranes--covered by protective layer of mucus Mechanical and chemical barrier that allows proper functioning Cross-linked gel structure composed of glycoprotein subunits BIOL 533 Lecture 5BIOL 533 2 Lecture 5 Constitutive Defenses • Barriers to entry – See Schaechter text, Table 6.1 • Mucous membranes—covered by protective layer of mucus – Mechanical and chemical barrier that allows proper functioning • Cross-linked gel structure composed of glycoprotein subunits