Excretory System
Functional Systems of Human Beings
avimanyu pramanik
Wed, 11/06/2019 - 18:34
Breathing — involves intake of oxygen (inspiration) from atmospheric air and expulsion of carbon dioxide (expiration). The respiratory system is composed of nostrils, wind pipe or trachea, bronchi and bronchioles, lungs. The lungs are enclosed in a compartment formed by the ribs, the breast bone and backbone and perform the function of respiration.
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