Which of the following correctly identifies the main functions of the respiratory system? I. Supplies oxygen to the bloodstream.
II. Removes carbon dioxide from the bloodstream.
III. Provides nutrients to the body.
IV. Controls growth of the body.

Choose ALL that correctly apply.

I and II

I and III

I and IV

II and III

The main functions of the respiratory system are supplies oxygen to the bloodstream and removes carbon dioxide from the bloodstream (corresponding to functions I and II, first option).

Explanation:

The respiratory system is made up of the airways —which carry air— and the lungs. This allows the respiratory function to take place, which consists of receiving oxygen (O₂)-rich air and eliminating air with carbon dioxide CO₂ content.

In the lungs are the pulmonary alveoli, structures that are found in relation to the pulmonary capillaries and responsible for gas exchange.

The air that enters the lungs ends up in the alveoli, where the O₂ diffuses to the capillary, oxygenating the blood that passes through it. At the same time, the blood with CO₂ that reaches the capillary passes to the alveoli to be eliminated during expiration.

This is the main function of the lungs and respiratory system, oxygenating the blood and eliminating the CO₂.

    The other options are not correct, since provide nutrients and control growth of the body depend on other systems, such as the digestive and endocrine systems.

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