Follow a human breath

The video explains the process of breathing, focusing on inhalation and exhalation. When we inhale, air enters through the nose and mouth, travels down the trachea, and fills the lungs. Oxygen from the air moves into the bloodstream, while carbon dioxide, a waste product, exits the bloodstream to be exhaled. The lungs then contract, forcing the air out through the nose and mouth, completing the breathing cycle.

What are the essential gases involved in the breathing process?

Explain how the lungs change during exhalation.