3.11 Red blood cells and oxygen transport
Exam question
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Which substance in red blood cells combines with oxygen?
(1)Total for this question: 1 mark
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3.11 Red blood cells and oxygen transport
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3.11 Red blood cells and oxygen transport
Exam question
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Explain how red blood cells are adapted to carry oxygen.
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Total for this question: 3 marks
3.11 Red blood cells and oxygen transport
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Describe what happens to haemoglobin in the lungs and in the tissues.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Explain why red blood cells are small and flexible.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Illustrative context: people living in the Andes.
Explain why people who live at high altitude have more red blood cells.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Red blood cell count in a climber Days at 4000 m Red blood cells / millions per mm³ 0 5.0 10 5.3 20 5.7 30 6.0 Illustrative data, not from a real investigation. Calculate the percentage increase in red blood cell count after 30 days at 4000 m.
(2)%Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
Exam question
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Red blood cell count in a climber Days at 4000 m Red blood cells / millions per mm³ 0 5.0 10 5.3 20 5.7 30 6.0 Illustrative data, not from a real investigation. Suggest why athletes sometimes train at high altitude before a race at sea level.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Iron deficiency causes anaemia. Why?
(1)Total for this question: 1 mark
3.11 Red blood cells and oxygen transport
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Carbon monoxide combines permanently with haemoglobin. Explain why carbon monoxide is dangerous.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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State the name of the compound formed when oxygen combines with haemoglobin.
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Total for this question: 1 mark
3.11 Red blood cells and oxygen transport
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Explain why a red blood cell cannot divide.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Suggest why red blood cells only live for about 120 days.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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Describe the shape of a red blood cell.
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Total for this question: 2 marks
3.11 Red blood cells and oxygen transport
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A red blood cell has a diameter of 7.5 µm. Calculate its diameter in mm.
(2)mmTotal for this question: 2 marks
3.11 Red blood cells and oxygen transport
Exam question
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Explain why oxygen diffuses from red blood cells into respiring muscle.
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Total for this question: 2 marks