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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Blood

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3

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Blood

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Paper 4Theory (Extended)3 marks

Blood clotting is a critical process in the human body.

Description

Blood Clotting Process

When a blood vessel is injured, platelets adhere to the site and release chemicals that initiate the clotting cascade, leading to the formation of a clot.

  1. a

    Explain the importance of blood clotting in preventing blood loss and blocking pathogens.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Blood

Paper 4Theory (Extended)3 marks

Description

Clotting Mechanism

The clotting mechanism involves a series of steps that lead to the formation of a stable clot, which is crucial for wound healing.

  1. a

    Discuss the consequences of impaired blood clotting.

    Aim for approximately 3 distinct marking points.

    [3]