What is the primary function of the respiratory system?

The primary function of the respiratory system is to inhale oxygen and exhale carbon dioxide. This essential process is known as respiration, which involves taking in oxygen from the atmosphere, transferring it into the bloodstream, and removing carbon dioxide, a waste product produced by cellular metabolism. Oxygen is crucial for cellular functions and energy production, while carbon dioxide must be expelled to maintain the body’s pH balance and prevent toxicity.

Inhalation brings fresh oxygen into the lungs, where it passes into the bloodstream via tiny air sacs called alveoli. Subsequently, carbon dioxide, which is collected from the blood, is expelled from the body when we exhale. This continuous exchange of gases supports cellular respiration in every tissue and is vital for life. Understanding this function highlights the respiratory system's role in maintaining homeostasis and overall health.