Fighting Disease

Fighting Disease

1. pathogens

   • bacteria
     • small living cells
       • damage cells
       • produce toxins
   • viruses
     • not cells
     • replicate by invading cells
     • produce copies of themselves and burst

2. your defence system

   • skin, hair, mucus
   • stops microorganisms getting in
     • cuts/platelets
       • help blood clot to seal wounds

3. immune system

   • white blood cells
     • travel around in blood patrolling for microbes
       • consume microbes
       • produce anitbodies (proteins) to kill antigens
       • produce antitoxins produced by bacteria