Question

which of the following is part of the respiratory system? the brain the kidneys the lungs the heart

Explanation:

The respiratory system is responsible for gas exchange. The brain is part of the nervous system, the kidneys are part of the excretory system, and the heart is part of the circulatory system. The lungs are the main organs of the respiratory system where oxygen is taken in and carbon dioxide is expelled.

Answer:

the lungs