Pearson Edexcel Level 3 GCE., Biology B Advanced PAPER 2: Advanced Physiology, Evolution and Ecology., Latest revisison material. graded A+

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Answer ALL questions. Write your answers in the spaces provided. 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 (a) The graph shows the pressure changes in the left side of the heart during one contraction. Key aorta left ventricle left atrium 0.20 0.4 0.6 0.8 16 12 8 4 0 Time / s Pressure / kPa (i) At what time does the atrioventricular (bicuspid) valve close? (1) A 0.14 s B 0.20 s C 0.45 s D 0.40 s (ii) Which is the sequence of structures that an impulse passes through during one heart contraction? (1) A atrioventricular node, bundle of His, sinoatrial node B atrioventricular node, sinoatrial node, bundle of His C sinoatrial node, bundle of His, atrioventricular node D sinoatrial node, atrioventricular node, bundle of His [Show More]

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