A-LevelBiologyGas exchangeFeb/Mar 2017Paper 2 Q58 Marks
(a) Smooth muscle and cartilage are two of the tissues found in the walls of structures of the gas exchange system of mammals. Complete Fig. 5.1 to show the distribution of these tissues in the gas exchange system of mammals. Choose from the four structures listed below. alveolus trachea bronchus bronchiole irregular plates and incomplete rings cartilage present incomplete rings only present cartilage absent absent [Figure 5.1]
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