3.14B Platelets and blood clotting
Exam question
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Which blood component starts the clotting process?
(1)Total for this question: 1 mark
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3.14B Platelets and blood clotting
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3.14B Platelets and blood clotting
Exam question
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Describe how a blood clot forms at a cut.
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Total for this question: 3 marks
3.14B Platelets and blood clotting
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Explain why blood clotting is important.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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Explain why fibrinogen must be soluble in the blood.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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People with haemophilia lack a clotting protein. Explain why a small cut can be dangerous for them.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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Which change happens when blood clots?
(1)Total for this question: 1 mark
3.14B Platelets and blood clotting
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Suggest why people with a low platelet count bruise easily.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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Explain why a scab forms over a wound.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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A blood clot inside a coronary artery can cause a heart attack. Suggest why.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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Illustrative data.
Clotting time of blood samples Sample Clotting time / minutes person with normal blood 6 person taking warfarin 19 person with haemophilia 45 Illustrative data, not from a real investigation. Calculate how many times longer the haemophilia sample took to clot than the normal sample.
(2)timesTotal for this question: 2 marks
3.14B Platelets and blood clotting
Exam question
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Clotting time of blood samples Sample Clotting time / minutes person with normal blood 6 person taking warfarin 19 person with haemophilia 45 Illustrative data, not from a real investigation. Warfarin is given to people at risk of strokes. Suggest why.
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Total for this question: 2 marks
3.14B Platelets and blood clotting
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State the name of the protein that forms threads in a clot.
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Total for this question: 1 mark