Non-Specific Body Defenses

Forms a mechanical border that prevents entry of pathogens and other harmful substances into the body.

• Epidermis

• Mucous

• Nasal Hairs

• Phagocytes

Proteins released by virus-infected cells that protect uninfected tissue cells from viral takeover, mobilize the immune system.

• Gastric Juices

• Natural Killer Cells

• Interferons

• Keratin

Continuously lubricated and cleanses the eyes (tears) and oral cavity (saliva); contains lysozymes, an enzyme that destroys microorganisms.

• Lacrimal Secretions; saliva

• Mucus

• Gastric Juice

• Acid mantle

Provides resistance against acids, alkalis, and bacterial enzymes.

• Complement

• Fluids and Acid pH

• Phagocytes

• Keratin

Traps microorganisms in respiratory and digestive tracts.

• Acid Mantle

• Cilia

• Mucus

• Interferon

Skin secretions make epidermal surface acidic, which inhibits bacterial growth; sebum also contains bacteria-killing chemicals.

• Mucus

• Memory B Cells

• Natural Killer Cells

• Acid Mantle

Propels debris laden mucus away from lower respiratory passages.

• Mucus

• Cilia

• Antibodies

• Fluids and pH

Contains concentrated hydrochloric acid and protein digesting enzymes that destroy pathogens in the stomach.

• Gastric Juices

• Killer T Cells

• Acid Mantle

• All of the above

• None of the above

Engulf and destroy pathogens that breach surface membrane barriers; macrophages also contribute to immune response.

• Keratin

• Nasal hairs

• Memory B Cells

• Phagocytes

Which of the following is not a antimicrobial chemical?

• Complement

• Interferons

• Fluids with acid pH

• Lacrimal Secretion