What does the term "expiration" refer to in the context of respiration?

The term "expiration" in the context of respiration specifically refers to the process of giving off carbon dioxide. This is part of the respiratory cycle that includes both inhalation and exhalation. During expiration, the diaphragm and intercostal muscles relax, allowing the lungs to decrease in volume and air, which is rich in carbon dioxide, to be expelled from the body.

This process is vital for maintaining the proper balance of gases in the bloodstream and ensuring that oxygen can continue to be efficiently delivered to the body’s cells. Understanding expiration helps clarify how the respiratory system works to rid the body of waste gases, thus supporting cellular metabolism and overall health.