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What is the main function of the respiratory system? A. to exchange oxygen and carbon dioxide gases within the body B. to protect the body against foreign substances, such as bacteria and viruses C. to send signals from one part of the body to other parts of the body D. to break down food into nutrients that can be circulated throughout the body

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mrworldwide

The respiratory system's main function is to exchange oxygen and carbon dioxide gases within the body. The organs that make up the respiratory system include the nose, pharynx and larynx, the trachea, bronchi, and the lungs. Each of these organs help with the process of breathing and/or the exchanging of gases within them.  :)

mahima6824soni

The main function of the respiratory system is to exchange oxygen and carbon dioxide gases within the body.

The correct option is A.

What is the respiratory system?

The respiratory system provides oxygen to the cells and releases other gases from the body which are not needed, such as carbon dioxide.

Respiration is a complex process whose first step is breathing.

When air came into the body, the respiratory molecules take oxygen from the air and provide oxygen to the cells.

Then by the process of expelling, the non-necessary air is expelled out the body.

Thus, the correct option is A.to exchange oxygen and carbon dioxide gases within the body.

Learn more about respiration, here:

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