Biology 9700 · AS & A Level · The immune system

The immune system — practice question

Phagocytes and lymphocytes form part of the body’s cellular defence against invading pathogens. Fig. 6.1 shows where phagocytes and lymphocytes originate and how they mature.
(a)[1]

Name the site from which phagocytes and lymphocytes originate.

(b(i))[3]

Identify cells A, B and C.

(b(ii))[1]

State the name of organ D.

(c)[5]

Explain the roles of cells A, B and C in an immune response. In your answer use the terms antigen and non-self.

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This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Lymphocytes originate in the bone marrow” …

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