ICSE Class 9 Answered
(a) How is respiratory tract kept free of dust particles?(b) What is the role of mucous lining in the respiratory tract?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
(a) The entire lining of the respiratory tract is formed of ciliated epithelium and mucous, which trap dust particles and micro-organisms and thereby, prevent them from entering inside the body.
(b) Mucous lining in the respiratory tract makes the air moist.
(b) Mucous lining in the respiratory tract makes the air moist.
Answered by | 04 Jun, 2014, 03:23: PM
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