Q: What does the respiratory system exchange between the body and the outside air?


Read this paragraph and choose the correct option from the provided answers:

The job of the respiratory system is the exchange of gases between the body and the outside air. This process, called respiration , actually consists of two parts. In the first part, oxygen in the air is drawn into the body and carbon dioxide is released from the body through the respiratory tract. In the second part, the circulatory system delivers the oxygen to body cells and picks up carbon dioxide from the cells in return. The lungs are organs of the respiratory system. It is in the lungs where oxygen is transferred from the respiratory system to the circulatory system.

 Choices:

- fluids

- blood

- nutrients

- gases


A:
gases