A-LevelBiologyEnergy and respirationOct/Nov 2020Paper 4 Q78 Marks
(a) Structures and compounds involved in respiration in anaerobic conditions include: A – pyruvate B - reduced NAD C - ethanol D - carbon dioxide E - cytoplasm F - NAD G - ethanal H - lactate I - oxygen J - mitochondrion Complete Table 7.1 by matching each description with one letter chosen from A to J to show the correct structure or compound. You may use each letter once, more than once or not at all. [Table 7.1] (b) Respiration in anaerobic conditions in muscle cells during vigorous exercise can create an oxygen debt. Extra oxygen is breathed in after exercise to pay back the oxygen debt. Explain two ways in which the mammalian body uses this extra oxygen.
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