Transport in humans
47 past-paper questions on Transport in humans · examined 2020–2025.
20258 questions
16 The table shows the mean rate of blood flow through some blood vessels. blood vessel mean rate of blood flow / mm per s W 0.4 X 5.0 Y 15.0 Z 1200.0 Which row correctly identifies the blood vessels? W X Y Z A main artery small artery small vein capillary B small vein small artery main artery capillary C capillary small vein small artery main artery D capillary small artery small vein main artery
17 What happens during blood clotting? A Insoluble fibrin is converted to soluble fibrinogen. B Insoluble fibrinogen is converted to soluble fibrin. C Soluble fibrin is converted to insoluble fibrinogen. D Soluble fibrinogen is converted to insoluble fibrin.
18 Which statement explains the association between smoking tobacco and emphysema? A Tobacco smoke can cause mutations in lung cells. B Tobacco smoke can lead to the breakdown of alveoli. C Tobacco smoke may reduce the growth of a fetus. D Tobacco smoke reduces the amount of oxygen carried by red blood cells.
© UCLES 2025 5090/11/O/N/25 [Turn over 19 What prevents pathogens from entering the human body? A antibodies and lymphocytes B antigens and memory cells C red blood cells and lymphocytes D stomach acid and mucus 10
14 The graph shows the concentration of substance X in a person’s blood before, during and after exercise. concentration of substance X in the blood exercise stops exercise starts at rest time What is substance X? A alcohol B glycogen C lactic acid D urea
17 What is the function of the hepatic vein? A to transport blood from the intestine to the liver B to transport blood from the liver to the vena cava C to transport blood to the kidney from the aorta D to transport blood to the liver from the aorta
© UCLES 2025 5090/12/O/N/25 18 A student measures the thickness of the walls of the four chambers of a heart. The measurements are 15 mm, 9 mm, 3 mm and 3 mm. Which row shows the correct measurements for the chambers of the heart? 15 mm 9 mm 3 mm 3 mm A left ventricle right ventricle right atrium left atrium B left ventricle left atrium right ventricle right atrium C right ventricle left ventricle right atrium left atrium D right ventricle left atrium left ventricle right atrium 9 3
19 There are approximately 5 million red blood cells in each mm 3 of blood. The mean diameter of red blood cells is 0.007 mm. Which row expresses this information correctly in standard form? number of red blood cells / mm 3 of blood mean diameter of red blood cells / mm A 5 10 6 7 10 3 B 5 10 –6 7 10 –3 C 5 10 6 7 10 –3 D 5 10 –6 7 10 3
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