How is the process of taking in and giving out of air facilitated in breathing?

Breathing involves two main processes: inhalation and exhalation. During inhalation, the diaphragm and intercostal muscles contract, expanding the chest cavity and creating a negative pressure that draws air into the lungs. Conversely, during exhalation, these muscles relax, allowing the chest cavity to decrease in volume, which pushes air out of the lungs. This rhythmic cycle ensures a continuous exchange of oxygen and carbon dioxide in the body.