What is the primary function of the respiratory system?

The primary function of the respiratory system is to facilitate gas exchange, specifically the intake of oxygen and the removal of carbon dioxide. This process occurs in the lungs, where oxygen from inhaled air passes into the bloodstream, and carbon dioxide, a waste product of metabolism, is expelled from the blood into the exhaled air.

This function is critical for maintaining the body's oxygen levels, which are essential for cellular respiration and energy production. Additionally, proper gas exchange helps to regulate the acid-base balance in the body, influencing overall metabolic processes. The respiratory system works in conjunction with the circulatory system to deliver oxygen to tissues and remove carbon dioxide, highlighting its essential role in sustaining life.

In contrast, digestion, circulation, and hormone production are functions attributed to other systems in the body, like the digestive system, cardiovascular system, and endocrine system, respectively.