Which of the following is NOT a function of the respiratory system in humans?

The respiratory system in humans serves multiple important functions, primarily focused on gas exchange and maintaining homeostasis. One of its main roles is to facilitate the exchange of oxygen and carbon dioxide between the air and the bloodstream. This process occurs in the alveoli, tiny air sacs in the lungs.

Additionally, the respiratory system plays a role in phonation, or sound production, which is achieved when air moves through the vocal cords in the larynx, allowing for speech and communication. The system also helps to filter, warm, and humidify the incoming air, removing particles and pathogens through mucous membranes and cilia lining the respiratory tract.

Storing nutrients, however, is not a function associated with the respiratory system. Nutrient storage and metabolism primarily occur in organs such as the liver, muscles, and adipose tissues. Therefore, the correct answer is that storing nutrients is not a function of the respiratory system.