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Learning objective

Explain how blood clotting serves to prevent blood loss and block the entry of pathogens.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Practise with linked questions.
Cambridge IGCSE BiologyTransport in animalsCore content

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Quick explanation

Explain how blood clotting serves to prevent blood loss and block the entry of pathogens

  • This point belongs to Blood, especially Blood outcomes.
  • You need to be able to explain how blood clotting serves to prevent blood loss and block the entry of pathogens.
  • The key ideas to know are State.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

State

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Paper 3 structured question: Blood

Paper 3Theory (Core)2 marks

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]
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