Multiple choice

The extracellular bacteria are found outside the living cells and can be detected quite easily by the immune system because T-cells can come in contact with them. Extracellular bacteria are killed by which of the following phenomena occurring between the host and the bacteria?

  1. Secreting exotoxins

  2. Impeding inflammatory reactions

  3. Phagocytosis and complement

  4. Toxin neutralisation

  5. C-reactive protein
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Major killing of extracellular bacteria is through phagocytosis and intracellular killing. Complement aids opsonisation of bacteria to facilitate phagocytosis but may also be responsible for the bactericidal action of fresh serum containing antibody on Gram-negative bacteria.

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