New York State Basic Emergency Medical Technician (EMT-B) Practice Exam

How is respiration defined in the context of medical terminology?

1. Movement of air between the lungs and environment

2. Gas exchange of O2 and CO2 in pulmonary capillaries

3. Consumption of oxygen by cells

4. Process of ventilation

The correct answer is: Gas exchange of O2 and CO2 in pulmonary capillaries

Respiration, in medical terminology, specifically refers to the process of gas exchange that occurs in the pulmonary capillaries, where oxygen is absorbed into the bloodstream and carbon dioxide is released from the blood into the lungs for exhalation. This definition captures the essence of respiration as a vital physiological process that is essential for maintaining the body's metabolism and overall function. While the movement of air between the lungs and the environment is an important part of breathing (ventilation), it does not encompass the full process of respiration, which is more about what happens at the cellular level in terms of gas exchange. Similarly, while the consumption of oxygen by cells is vital for cellular respiration, it refers to the use of oxygen in cellular processes rather than the exchange itself in the lungs, which is a crucial part of respiration. Lastly, the term "process of ventilation" pertains more to the physical act of moving air into and out of the lungs rather than the gas exchange, which is the primary focus of respiration. Thus, option B provides the most accurate and comprehensive definition of respiration in medical terminology.