Endocrine Phys

Innate defenses(first line of defense, surface barrier

Tight Junctions

keep bacteria from entering between cells

Keratin

Make skin tough

Sebum

slightly acidic denters growth of most pathogenic organisms

Mucus

In nasal passages and bronchi trap pathogens and other debris

Hydrochloric acid

in stomach destroyed ingested pathogens

Normal Flora

of the skin, mouth, and gut, are good bacteria which provide competition for bad bacteria