respiration in human beings.
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6
Answer:
The primary organs of the respiratory system are the lungs, which function to take in oxygen and expel carbon dioxide as we breathe. The gas exchange process is performed by the lungs and respiratory system. Air, a mix of oxygen and other gases, is inhaled.
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9
Answer:
Inhalation and exhalation
Explanation:
During inhalation muscles of ribs and diaphragm contract thorax moves upwards and outward. This increase volume of thorax which decrease pressure in lungs
During exhalation muscles of ribs and diaphragm relac thorax moves downward and inward. This decrease volume of thorax which increase pressure in lungs and co2 is given out
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