3.24B Structure of a nephron
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What is a nephron?
(1)Total for this question: 1 mark
3(i) EXCRETION · EXAM QUESTIONS
3.24B Structure of a nephron
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3.24B Structure of a nephron
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Name, in order, the parts of a nephron that filtrate passes through.
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Total for this question: 4 marks
3.24B Structure of a nephron
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State the name of the knot of capillaries inside the Bowman's capsule.
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Total for this question: 1 mark
3.24B Structure of a nephron
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Explain why the proximal convoluted tubule is long and coiled.
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Total for this question: 2 marks
3.24B Structure of a nephron
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State the function of the collecting duct.
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Total for this question: 1 mark
3.24B Structure of a nephron
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State the main function of the loop of Henle.
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Total for this question: 1 mark
3.24B Structure of a nephron
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Explain why the cells of the proximal convoluted tubule have microvilli and many mitochondria.
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Total for this question: 2 marks
3.24B Structure of a nephron
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Where does ultrafiltration take place?
(1)Total for this question: 1 mark
3.24B Structure of a nephron
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Where is glucose reabsorbed?
(1)Total for this question: 1 mark
3.24B Structure of a nephron
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Describe how the composition of the fluid changes as it passes along a nephron.
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Total for this question: 3 marks
3.24B Structure of a nephron
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Illustrative data.
Concentration of substances in a nephron Substance Plasma in glomerulus / g per dm³ Filtrate in capsule / g per dm³ Urine / g per dm³ protein 80 0 0 glucose 1.0 1.0 0 urea 0.3 0.3 20 salts 7.2 7.2 15 Illustrative data, not from a real investigation. Explain why protein is not found in the filtrate.
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Total for this question: 2 marks
3.24B Structure of a nephron
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Concentration of substances in a nephron Substance Plasma in glomerulus / g per dm³ Filtrate in capsule / g per dm³ Urine / g per dm³ protein 80 0 0 glucose 1.0 1.0 0 urea 0.3 0.3 20 salts 7.2 7.2 15 Illustrative data, not from a real investigation. Explain why glucose is in the filtrate but not in the urine.
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Total for this question: 2 marks
3.24B Structure of a nephron
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Concentration of substances in a nephron Substance Plasma in glomerulus / g per dm³ Filtrate in capsule / g per dm³ Urine / g per dm³ protein 80 0 0 glucose 1.0 1.0 0 urea 0.3 0.3 20 salts 7.2 7.2 15 Illustrative data, not from a real investigation. Calculate how many times more concentrated urea is in the urine than in the filtrate.
(2)timesTotal for this question: 2 marks
3.24B Structure of a nephron
Exam question
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Concentration of substances in a nephron Substance Plasma in glomerulus / g per dm³ Filtrate in capsule / g per dm³ Urine / g per dm³ protein 80 0 0 glucose 1.0 1.0 0 urea 0.3 0.3 20 salts 7.2 7.2 15 Illustrative data, not from a real investigation. Explain why urea is more concentrated in urine than in the filtrate.
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Total for this question: 2 marks
3.24B Structure of a nephron
Exam question
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Concentration of substances in a nephron Substance Plasma in glomerulus / g per dm³ Filtrate in capsule / g per dm³ Urine / g per dm³ protein 80 0 0 glucose 1.0 1.0 0 urea 0.3 0.3 20 salts 7.2 7.2 15 Illustrative data, not from a real investigation. Suggest why glucose in the urine is a sign of diabetes.
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Total for this question: 2 marks