Describe the human body's initial non-specific defence mechanisms against pathogen entry, specifically detailing the protective roles of the skin, nose, trachea, bronchi, and stomach acid.
Explain the crucial, active role of the internal immune system in robustly defending the body once a pathogen has successfully entered.
Describe the primary biological response of the immune system in quickly identifying and attempting to completely destroy invading pathogens.
Explain the three main biological ways white blood cells defend the body: phagocytosis (engulfing and digesting pathogens), targeted antibody production, and antitoxin production.
