Question

The diagram below shows the lungs, which are the main organs in the respiratory system.


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
Reset Submit

Answer 1

The main function of the respiratory system is:

**A. to exchange oxygen and carbon dioxide gases within the body**.