The immune system defends humans from pathogens. Physical and chemical barriers prevent infection. White blood cells attack pathogens. Immunisations usually involve injecting inactive pathogens.
Which of these is a chemical defence against infection?
What type of cell engulfs pathogens?
Red blood cells
Which molecules neutralise substances produced by pathogens?
What do antibiotics kill?
Bacteria and viruses
Who discovered the first antibiotic?
Which of these is a non-specific defence against disease?
Which of these do lymphocytes produce?
What do goblet cells produce?
What do phagocytes produce to destroy pathogens?
What is true of white blood cells in a second exposure to infection?
They are produced more rapidly and in greater numbers
They are produced more slowly but in greater numbers
They are produced more rapidly but in lower numbers