Final Answer:
When you inhale, air enters your lungs.
Step-by-step explanation:
When you inhale, a complex process involving the respiratory system takes place. The diaphragm, a dome-shaped muscle beneath the lungs, contracts, and the ribcage expands. This action increases the volume of the thoracic cavity, creating a pressure gradient. As a result, air is drawn into the lungs, filling the expanded space. This inhalation process is facilitated by the negative pressure generated, allowing air to flow from the higher atmospheric pressure outside the body to the lower pressure within the lungs.
The entrance of air into the lungs during inhalation is crucial for the exchange of oxygen and carbon dioxide in the respiratory system. Oxygen is taken up by the blood in the lungs and transported to the body's cells, while carbon dioxide, a waste product of cellular metabolism, is expelled from the body during exhalation.