(iv) 5 - 7 hours (02 marks) (c) Account for the difference in the concentration of glucose in hepatic portal vein and the iliac vein between 2 and 4 hours. (02 marks) (d) Explain why the concentration of amino acids in the hepatic portal vein took longer to increase. (01 mark) MOVEMENT IN AND OUT OF CELLS 10. Mammalian red blood cells transferred from blood plasma to a less concentrated solution swell, and if they swell sufficiently, they burst; in which case they are said to have haemolysed. And when comparable discs of potato tuber are placed in sucrose solutions of varying concentrations their mass changes. The table below shows the percentage of red blood cells haemolysed and the percentage change in mass of discs of potato tuber separately placed in a series of sucrose solutions ranging from 0.0 to 0.6M in covered dishes at a constant temperature of 200C. Concentration of sucrose Red cells haemolysed Mass of potato tuber discs solution (mol/dm3) 0.0 100 + 22 0.1 90 + 17 0.3 80 + 9 0.3 68 + 3 0.4 30 -3 0.5 16 -10 0.6 0 -15 Represent the information graphically using the same set of axes. (07 marks)
(iv) 5 - 7 hours (02 marks) (c) Account for the difference in the concentration of glucose in hepatic portal vein and the iliac vein between 2 and 4 hours. (02 marks) (d) Explain why the concentration of amino acids in the hepatic portal vein took longer to increase. (01 mark) MOVEMENT IN AND OUT OF CELLS 10. Mammalian red blood cells transferred from blood plasma to a less concentrated solution swell, and if they swell sufficiently, they burst; in which case they are said to have haemolysed. And when comparable discs of potato tuber are placed in sucrose solutions of varying concentrations their mass changes. The table below shows the percentage of red blood cells haemolysed and the percentage change in mass of discs of potato tuber separately placed in a series of sucrose solutions ranging from 0.0 to 0.6M in covered dishes at a constant temperature of 200C. Concentration of sucrose solution (mol/dm3) Red cells haemolysed Mass of potato tuber discs 0.0 0.1 0.3 0.3 0.4 0.5 0.6 100 90 80 68 30 16 0 + 22 + 17 + 9 + 3 -3 -10 -15 Represent the information graphically using the same set of axes. (07 marks)