Humam Defences Against Disease

Question 1

Body’s defences

Answer 1

• nose traps particles that may contain pathogens
• trachea has cilia which sweeps mucus away
• skin, sebaceous gland produced sebum, which kills bacteria and fungi
• stomach- hydrochloric acid which kills bacteria in food
• eyes- enzymes in tears destroy microorganisms

Question 2

WBCs help to defend against pathogens through:

Answer 2

-phagocytosis, involves pathogen being surrounded, engulfed and digested

Question 3

Antibodies are _____ to a

Answer 3

Specific to a particular pathogen

Question 4

What is the name of the protein molecules made by white blood cells when they detect a pathogen

Answer 4

ANTIBODIES, which attack to an ANTIGEN molecules on the pathogen