Respiration refers to the process of breathing, which involves the exchange of gases between the body and the environment. It encompasses the following steps:  

• Inhalation: Taking in oxygen from the air. 
• Gas exchange: In the lungs, oxygen diffuses from the alveoli (tiny air sacs) into the bloodstream, while carbon dioxide diffuses from the blood into the alveoli. 
• Exhalation: Expelling carbon dioxide from the body. 

Respiration is essential for maintaining oxygen levels in the body and removing waste products like carbon dioxide. It also involves the muscular movements of the diaphragm and chest muscles to expand and contract the lungs. 

Synonyms: Breathing, Ventilation, and Pulmonary gas exchange.