Pearson Edexcel International GCSE, Human Biology UNIT: 4HB1 PAPER: 01. 100% comprehensive paper

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Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 The ... diagram shows a human heart in simple form. Q P R S M N right left (a) (i) Which of these is the name of blood vessel M? (1) A aorta B pulmonary artery C pulmonary vein D vena cava (ii) Which of these is the name of blood vessel N? (1) A aorta B pulmonary artery C pulmonary vein D vena cava (iii) Draw arrows on the diagram to show the flow of blood through the heart. (2) https://britishstudentroom-b430a.web.app/ *P67059A0324* Turn over 3 (iv) Explain why the blood can only flow in the direction of the arrows. 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(b) The width of the walls of each of the four chambers is measured. These are the results. 0.2 cm 1.0 cm 1.5 cm 0.2 cm (i) Complete the table by putting the correct width next to the letter of each chamber. (3) Chamber Width in cm P Q R S (ii) Explain the differences in the widths. 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(Total for Question 1 = 12 marks) https://britishstudentroom-b430a.web.app/4 *P67059A0424*  2 A student investigates absorption in the ileum by using a model gut made of Visking tubing. This is the student's method. • tie a knot in one end of a 15 cm length of Visking tubing to make a bag • place 5 cm3 of starch suspension and 5 cm3 of glucose solution into the bag • rinse the outside of the bag with water • place the bag into a boiling tube containing distilled water • leave the bag for one hour The diagram shows the student's apparatus. boiling tube Visking tubing water After an hour the contents of the Visking tubing bag are tested for glucose and starch. The water in the boiling tube is also tested for glucose and starch. [Show More]

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