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प्रश्न
How is the respiratory passage kept free of dust particles?
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उत्तर
The nasal cavity is lined by ciliated epithelium and mucous glands. The mucous glands secrete mucous. The ciliated epithelium is present on the entire lining of larynx, trachea, bronchi and bronchioles. The constant motion of cilia and mucous trap dust, micro-organisms, pollen and other minute particles present in the air. In this way, the respiratory passage is kept free of dust particles.
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संबंधित प्रश्न
State whether the statement is true or false:
Aquatic animals breathe at a slower rate than the terrestrial animals.
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(a) chlorophyll
(b) chloroplast
(c) stomata
(d) epidermis
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Name the red pigment which carries oxygen in blood.
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State the three common features of all the respiratory organs like skin, gills and lungs.
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Leaves
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(d) Which organism/organisms undergo anaerobic respiration?
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