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Cambridge IGCSE Biology practice

What triggers the conversion of fibrinogen to fibrin?

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MCQ

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cambridge_mcq

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Topic

Blood

Exam-style question

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What triggers the conversion of fibrinogen to fibrin?.

  1. A.Chemicals released by platelets
  2. B.Oxygen in the blood
  3. C.Red blood cells
  4. D.White blood cells

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Paper 3 structured question: Blood

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Description

Blood Clotting Process

When a blood vessel is injured, platelets stick to the damaged area and release chemicals. These chemicals cause fibrinogen to change into fibrin, which forms a mesh trapping blood cells and forming a clot.

  1. a

    State one way blood clotting prevents blood loss.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify one way blood clotting helps prevent infection.

    Aim for approximately 1 distinct marking point.

    [1]