physical and chemical barriers

• Reduce spread of STIs & chlamydia:

  • Abstain from sexual activity

  • Barrier-type contraception (condoms)
• Physical:

  • Mucus traps pathogens before it goes down the trachea and into the lungs.

  • Cilia haircells lined in the trachea to move mucus & pathogens up to be coughed out.

  • Cut skin heals by blood clots.
• Chemical:

  • Lysozymes in tears protect the eyes from bacteria.

  • Hydrochloric acid in stomach makes an acidic environment which reduces infection.