pressure-volume curves

Pressure-volume curves visually represent how the lungs expand and contract during breathing. The graph plots lung pressure against the volume of air in the lungs. As you inhale, lung volume increases and pressure changes; during exhalation, the volume decreases. The curve illustrates lung compliance, or how easily the lungs stretch, and resistance to airflow. Steeper curves indicate more flexible lungs, while flatter curves suggest stiffness. These curves help healthcare professionals assess lung function, diagnose respiratory conditions, and monitor treatment effectiveness by understanding how well the lungs can fill and empty with air.