Describe the self-cleaning mechanism of the lungs.
the respiratory system windpipe air sac lung (a) Circle the correct words to complete the following sentences. bone (i) The windpipe is kept open by rings of fibre cartilage bronchi (ii) The windpipe divides into two . bronchioles 1 . 1 (b) Name the type of blood vessel which surrounds the air sacs. ……………………………………………………………………………………………… (c) […]
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