Excretion in Humans Past Paper PDF

# Chapter 13 Excretion in humans ## 13.1 Excretion in humans ### 744. 0610_m22_qp_22 Q: 24 Which term describes the removal of the nitrogen-containing part of amino acids to form urea? - A assimilation - B deamination - C denaturation - D digestion ### 745. 0610_s21_qp_21 Q: 25 Which statement...

# Chapter 13 Excretion in humans ## 13.1 Excretion in humans ### 744. 0610_m22_qp_22 Q: 24 Which term describes the removal of the nitrogen-containing part of amino acids to form urea? - A assimilation - B deamination - C denaturation - D digestion ### 745. 0610_s21_qp_21 Q: 25 Which statement about urea is correct? - A Urea is formed from excess amino acids in the kidneys and excreted by the liver. - B Urea is formed from excess glucose in the liver and egested by the kidneys. - C Urea is formed from excess glucose in the kidneys and egested by the liver. - D Urea is formed from excess amino acids in the liver and excreted by the kidneys. ### 746. 0610_s21_qp_22 Q: 25 The diagram shows some of the organs in the human body. - Organ 1 is labelled as the top of the diagram (above the liver) - Organ 2 is labelled as the lower left side of the diagram (liver) - Organ 3 is labelled as the lower right side of the diagram (intestines) Which row matches the function to the correct organ? | | excretes carbon dioxide | excretes urea | produces urea | |---|---|---|---| | A | 1 | 2 | 3 | | B | 1 | 3 | 2 | | C | 2 | 3 | 1 | | D | 2 | 1 | 3 | ## 13.1. EXCRETION IN HUMANS ### 747.0610_s21_qp_23 Q: 25 A student carried out an experiment to investigate the effect of temperature on the volume of urine produced. Which row shows the experiment where the environmental temperature was increased from 20 °C to 40 °C but no other changes were made? | | urine produced/cm³ per hour before | urine produced/cm³ per hour after | |---|---|---| | A | 60 | 60 | | B | 80 | 40 | | C | 120 | 145 | | D | 100 | 130 | ### 748.0610_w21_qp_21 Q: 23 The diagram shows the structure of part of a kidney tubule and associated blood vessels. - X is labelled to the right of the loop of Henle - Glomerulus is labelled to the left of the loop of Henle Which substances are normally present in the filtrate at X? | | glucose | urea | |---|---|---| | A | absent | absent | | B | absent | present | | C | present | absent | | D | present | present | ## CHAPTER 13. EXCRETION IN HUMANS ### 749. 0610_w21_qp_22 Q: 24 The diagram shows a mammalian kidney. - X is the outer layer of the kidney. - Y is the inner layer of the kidney. - Z is a tube connecting the kidney to the bladder. What are areas X, Y and Z? | | X | Y | Z | |---|---|---|---| | A | cortex | medulla | ureter | | B | cortex | ureter | medulla | | C | medulla | cortex | ureter | | D | medulla | ureter | medulla | ### 750.0610_w21_qp_23 Q:24 The diagram shows a kidney tubule. - The diagram shows a loop of Henle. - The position of glomerulus is labelled at the top of the loop. - The "to ureter" label is at the bottom of the loop. In which part of the tubule is the glucose concentration highest? - A - B - C - D ## 13.1. EXCRETION IN HUMANS ### 751.0610_m20_qp_22 Q: 25 The diagram shows a kidney and its blood vessels. - The diagram shows a kidney. - The artery is labelled above the kidney. - The vein is labelled below the kidney. - The ureter is labelled at the bottom of the kidney. In a healthy person, which structure(s) transport glucose? - A artery only - B artery and ureter - C artery and vein - D ureter and vein ### 752.0610_p20_qp_20 Q: 20 The diagram shows a kidney tubule and some of its associated blood vessels. - The diagram shows a loop of Henle with associated blood vessels. - R is labelled at the bottom of the loop - the point where the fluid exits the loop. - P is labelled on the blood vessel at the top of the loop. Which substance is entirely reabsorbed from the fluid at R to the blood at P? - A glucose - B salts - C urea - D water ## CHAPTER 13. EXCRETION IN HUMANS ### 753. 0610_s20_qp_21 Q: 23 In healthy people, which substance is completely reabsorbed into the blood from the kidney tubules? - A glucose - B salts - C urea - D water ### 754. 0610_s20_qp_22 Q: 23 What is filtered out of the blood in the glomerulus into the kidney tubule? | | glucose | urea | |---|---|---| | A | ✓ | X | | B | X | ✓ | | C | X | ✓ | | D | X | X | ### 755.0610_s20_qp_23 Q: 22 Blood glucose level is kept between 5-7 mmol per dm³. The concentration of glucose in the intestine varies and is often less than that value. What would be required for the absorption of glucose into the blood when the concentration of glucose in the intestine is less than 5 mmol per dm³? - 1 mitochondria - 2 oxygen - 3 membrane proteins - A 1 only - B 1 and 2 only - C 2 and 3 only - D 1, 2 and 3 ### 756. 0610_w20_qp_21 Q: 22 The table shows the composition of blood entering and leaving the liver and the kidneys. Which row is correct? | | highest concentration of urea in the blood | lowest concentration of urea in the blood | |---|---|---| | A | entering kidneys | leaving liver | | B | entering kidneys | entering liver | | C | leaving kidneys | entering liver | | D | leaving kidneys | leaving liver | ### 757.0610 w20_qp_22 Q: 22 How do the concentrations of glucose and urea in urine compare to their concentrations in blood plasma? | | glucose concentration in urine (compared to blood plasma) | urea concentration in urine (compared to blood plasma) | |---|---|---| | A | higher | lower | | B | higher | same | | C | same | same | | D | lower | higher | ### 758.0610 w20 qp 23 Q: 22 What happens as a result of deamination? - A Amino acids are converted to proteins. - B Glycogen is stored. - C Starch is produced. - D Urea is produced. ## CHAPTER 13. EXCRETION IN HUMANS ### 759.0610_m19_qp_22 Q: 24 The diagram shows the structure of a kidney tubule. - The diagram shows a nephron. - A is labelled at the glomerulus. - B is labelled at the proximal convoluted tubule. - C is labelled at the loop of Henle. - D is labelled at the distal convoluted tubule. Where does filtration occur? - A - B - C - D ### 760.0610_s19_qp_21 Q: 25 What is a function of the liver? - A converting bile to urea - B converting urea to amino acids - C deamination of amino acids - D deamination of carbon dioxide ### 761. 0610 s19 qp 22 Q: 25 The diagram shows the first part of a kidney tubule and its blood supply. - The diagram shows a glomerulus and associated blood vessels. - A is labelled at the top of the glomerulus. - B is labelled at the bottom of the glomerulus. - C is labelled at the end of the blood vessel that continues past the glomerulus. - D is the blood vessel directly attached to the glomerulus. During filtration, protein molecules do not pass through the wall of the glomerulus. Which part contains the highest concentration of protein? - A - B - C - D ## 13.1. EXCRETION IN HUMANS ### 762. 0610_s19_qp_23 Q: 25 Dialysis is a method of regulating the composition of blood when the kidneys are not working properly. Which substance is absent from fresh dialysis fluid? - A bile - B glucose - C salt - D water ### 763. 0610_w19_qp_21 Q: 25 A patient has dye injected into the blood supply to his kidneys. The dye appears in his excretory system as shown. The diagram shows the kidney and associated blood vessels. The kidney is labelled with dye; the ureter and bladder are not. Which part is blocked? - A the kidney - B the ureter - C the bladder - D the urethra ## CHAPTER 13. EXCRETION IN HUMANS ### 764. 0610_m18_qp_22 Q: 18 The diagram shows a section of a kidney. - The diagram shows a kidney. - X is the outer layer of the kidney. - Y is the inner layer of the kidney. - Z is a tube connecting the kidney to the bladder. What are the correct labels? | | X | Y | Z | |---|---|---|---| | A | cortex | medulla | ureter | | B | cortex | ureter | medulla | | C | medulla | cortex | ureter | | D | medulla | ureter | cortex | ### 765.0610_s18_qp_21 Q: 22 The table shows the presence or absence of chemicals in solution in different parts of a healthy kidney. Which row is correct? | | blood plasma in glomerulus | fluid entering kidney tubule | fluid in ureter | |---|---|---|---| | A | X | X | ✓ | | B | ✓ | ✓ | ✓ | | C | X | X | ✓ | | D | ✓ | ✓ | X | ### 766.0610_s18_qp_23 Q: 22 The diagram shows a kidney and associated structures. - The diagram shows a kidney. - X is labelled to the right of the kidney, on the blood vessel. - The blood vessel is labelled "blood in" on the left of the kidney. - The blood vessel is labelled "blood out" on the right of the kidney. What is the name of structure X? - A pulmonary artery - B pulmonary vein - C renal artery - D renal vein ### 767. 0610_w18_qp_21 Q: 22 Which row describes the functions of the bladder, kidneys and liver? | | production of urea | excretion of urea | storage of urine | |---|---|---|---| | A | liver | bladder | kidneys | | B | bladder | kidneys | liver | | C | liver | kidneys | bladder | | D | kidneys | liver | bladder | ### 768. 0610_w18_qp_22 Q: 22 A person carries out vigorous exercise without drinking any water. What would happen to the concentration and volume of the person's urine immediately after exercise? | | urine concentration | urine volume | |---|---|---| | A | decrease | decrease | | B | decrease | increase | | C | increase | decrease | | D | increase | increase | ## CHAPTER 13. EXCRETION IN HUMANS ### 769.0610_w18_qp_23 Q: 22 Which row correctly shows the organ where each substance is excreted? | | carbon dioxide | excess water | salts | urea | |---|---|---|---|---| | A | kidneys | liver | lungs | lungs | | B | liver | liver | liver | skin | | C | lungs | kidneys | kidneys | kidneys | | D | lungs | kidneys | liver | skin | ### 770.0610_m17_qp_22 Q: 21 Which substance remains in the blood as it passes through the kidney? - A protein - B salts - C urea - D water ### 771. 0610_s17_qp_21 Q: 22 A longitudinal section of the kidney and some associated structures have been labelled. Which labelling is correct? - **A** - **B** - **C** - **D** ### 772. 0610_s16_qp_21 Q: 24 An amino acid is deaminated. This is the removal of - A the carbon-containing part. - B the nitrogen-containing part. - C the oxygen-containing part. - D the sulfur-containing part. ## CHAPTER 13. EXCRETION IN HUMANS ### 773.0610_s16_qp_22 Q: 22 Which diet will cause the liver to produce the most urea? - A high carbohydrate, low fat - B high fat, high fibre - C high fat, low protein - D high protein, low carbohydrate ### 774. 0610_s16_qp_23 Q: 23 What is an example of excretion in mammals? - A the release of hormones from glands - B the release of saliva into the mouth - C the removal of undigested food through the anus - D the removal of urea by the kidneys ### 775. 0610_w16_qp_21 Q: 24 What happens as a result of deamination in the liver? - A Alcohol is broken down. - B Glycogen is stored. - C Glucose is produced. - D Urea is produced. ### 776. 0610_w16_qp_22 Q: 25 In a kidney tubule, which substances are filtered out of the blood in the glomerulus? - A glucose, protein, salts and water - B glucose, protein, urea and water - C glucose, salts, urea and water - D protein, salts, urea and water