Pearson Edexcel Level 3 GCE 9BN0/02 2022 Biology A (Salters Nuffield) Advanced PAPER 2: Energy, Exercise and Co‑ordination

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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 Blood from the lungs returns to the left side of the heart in the pulmonary vein. The pulmonary vein does not have valves. (a) (i) Describe how the atrioventricular (AV) valves work during one cardiac cycle. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) The structure of the pulmonary vein is different from the structure of the pulmonary artery. Explain how this difference is related to the function of the pulmonary vein. (2) .................................................................................................................................................................................................................................................................................... ...................................................................................................................................................................................................................................................................... [Show More]

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