Question 8

To transport oxygen and carbon dioxide

The primary function of the respiratory system is to transport oxygen into the body and remove carbon dioxide from it. This gas exchange is crucial for maintaining cellular respiration and overall metabolic processes.

A) To digest food

This option is incorrect as the digestive system is responsible for breaking down food and absorbing nutrients. The respiratory system does not play a role in digestion; its primary focus is on gas exchange.

B) To control body movement

This choice is also incorrect. The control of body movement is primarily managed by the muscular and nervous systems. The respiratory system's main function revolves around the exchange of gases, not movement control.

C) To transport oxygen and carbon dioxide

This option is correct as it encapsulates the fundamental role of the respiratory system. It facilitates the inhalation of oxygen, which is essential for cellular metabolism, and the exhalation of carbon dioxide, a waste product of that metabolism.

D) To circulate blood

This option is incorrect. Circulation of blood is the primary function of the cardiovascular system, not the respiratory system. While the respiratory system is involved in gas exchange, it does not circulate blood.

Conclusion

The correct answer, "to transport oxygen and carbon dioxide," accurately describes the essential function of the respiratory system. In contrast, the other options pertain to different bodily systems, illustrating that they do not fulfill the primary role associated with respiration.