Respiratory mechanics refers to the physical processes involved in breathing, including how air moves in and out of the lungs. It involves the actions of the diaphragm and intercostal muscles, which expand and contract the chest cavity, creating pressure changes that allow air to flow. The efficiency of respiratory mechanics is influenced by factors such as lung compliance and airway resistance. Lung compliance measures how easily the lungs can expand, while airway resistance indicates how easily air can pass through the airways. Together, these factors determine how effectively we can breathe.