What is the main function of the respiratory system?

The primary function of the respiratory system is the absorption of oxygen. This system is responsible for taking in oxygen from the atmosphere and facilitating its transfer into the bloodstream. The oxygen is then transported to cells throughout the body, where it is used for cellular respiration to produce energy.

In addition to oxygen absorption, the respiratory system also plays a crucial role in expelling carbon dioxide, a waste product of metabolism, from the body during the process of exhalation. This exchange of gases—taking in oxygen and removing carbon dioxide—is vital for maintaining the body’s metabolic functions and overall homeostasis.

The other options listed relate to functions performed by different systems in the body. The production and delivery of sperm pertains to the reproductive system, while the elimination of wastes is associated with the excretory system. Nutrient breakdown and absorption are functions of the digestive system. Each body system works in synergy, but the distinct role of the respiratory system is focused on the absorption of oxygen and gas exchange.