The major role of the respiratory system is to?

The major role of the respiratory system is to provide oxygen to the blood, which is essential for sustaining life. When we inhale, oxygen from the air enters the lungs and diffuses into the bloodstream through the alveoli, the tiny air sacs within the lungs. This oxygen is then transported by the blood to the body's tissues and organs, where it is utilized for cellular respiration, a process that generates energy.

In addition to facilitating oxygen intake, the respiratory system also plays a crucial role in the removal of carbon dioxide, a byproduct of metabolism, from the body. This exchange of gases is vital for maintaining the acid-base balance in the body and ensuring that metabolic processes can occur efficiently.

While protecting organs, moving limbs, and regulating hormone levels are important functions carried out by other systems in the body, they do not fall under the primary responsibilities of the respiratory system. The focus of this system is specifically on gas exchange and the maintenance of oxygen levels in the blood, making it a fundamental component of overall health and well-being.