Natural (Non-Specific Immunity - 3
•Four components of the system - continued
•2.Three physiological barriers:
•˜Temperature
•˜Low pH
•˜Chemical mediators
•&body temperature (37oC) inhibits growth of some pathogens
•&fever response inhibits growth of some pathogens
•&acidic pH of stomach (1.5 - 3.5)
•&lysozymes (tears and saliva) cleave bacterial cell walls
•&interferon - antiviral
•&complement - lyses cells & enhances phagocytosis