During expiration, the diaphragm relaxes and the intercostal muscles also relax, leading to a decrease in thoracic volume and expulsion of air from the lungs.

The esophagus is part of the digestive system, while the trachea, larynx, and bronchi are components of the respiratory system.

The medulla oblongata is the part of the brain that controls the rhythm of breathing by sending signals to the respiratory muscles.

The medulla oblongata is responsible for regulating the rate and depth of breathing by sending signals to the respiratory muscles.

The medulla oblongata is the part of the brain that regulates the rhythm of breathing.

Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.

The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.

The alveoli are tiny air sacs in the lungs where the majority of gas exchange occurs between air and blood.

Gas exchange occurs in the alveoli, where oxygen is absorbed into the blood and carbon dioxide is released from the blood.