What does inhalation result in?

Inhalation is the process of taking air into the lungs, and it leads to the expansion of the lungs with air. As the diaphragm contracts and moves downwards, and the intercostal muscles pull the ribs upward and outward, the thoracic cavity expands, creating a negative pressure that allows air to flow in. This influx of air increases the lung volume, enabling oxygen-rich air to reach the alveoli where gas exchange occurs. Without this critical process of lung expansion and air intake, the body would be unable to acquire the oxygen it needs for cellular respiration, resulting in insufficient oxygen delivery to tissues. Thus, the correct answer accurately describes a fundamental aspect of the respiratory process during inhalation.