Pearson Edexcel International GCSE (9–1) Human Biology UNIT: 4HB1 PAPER: 02. Latest Comp[rehensive paper. Graded A+

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Answer ALL questions. 1 The diagram shows a section through a human brain. (a) Using lines, label these structures on the diagram. • cerebral hemisphere • cerebellum • pituitary gland • ... hypothalamus (4) (b) State which structure in part (a) is responsible for each of these functions. (4) Function Structure control of muscle tone and posture intelligence and thought monitoring of body temperature release of ADH (Total for Question 1 = 8 marks) http://britishstudentroom.wordpress.com/4 *P66433A0424* 2 Aerobic respiration is the process that releases energy for use in the body. (a) Give the word equation for the process of aerobic respiration. (4) ...................................................... + ...................................................... → ...................................................... + ...................................................... + energy (b) A spirometer is used to measure the volumes of air breathed in and the volumes of air breathed out. The spirometer trace shows the readings taken of a person at rest. A 1 dm3 20 s B C (i) Calculate the rate of breathing between points A and B shown on the trace. (2) rate = .............................................................. breaths per minute (ii) Calculate the difference in the volume of air breathed in and the volume of air breathed out between points B and C. (3) difference in volume = .............................................................. dm3 http://britishstudentroom.wordpress.com/*P66433A0524* Turn over 5 (c) Describe the differences that would be seen in the trace between points A and B if the person had been exercising vigorously before the readings were taken. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 2 = 11 marks) http://britishstudentroom.wordpress.com/6 *P66433A0624* 3 The diagram shows a biosensor that can be used to measure the concentration of urea in urine. display ammonium ion sensor ammonium ions immobilised urease enzyme partially permeable membrane molecules of solute urea molecules (a) (i) The urea molecules are in solution. State the name of the solvent. (1) .................................................................................................................................................................................................................................................................................... (ii) Explain the function of the partially‑permeable membrane. (2) ................................................................................................................................................................................. [Show More]

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