What is the waste gas removed from the blood during expiration?

The waste gas removed from the blood during expiration is carbon dioxide. This process occurs in the respiratory system, where oxygen is taken in during inhalation and carbon dioxide is expelled during exhalation.

Within the body, carbon dioxide is produced as a byproduct of cellular respiration, where cells utilize oxygen to generate energy. As blood circulates through the body and reaches the lungs, carbon dioxide is transferred from the blood into the alveoli (the tiny air sacs in the lungs), where it is then expelled from the body through exhalation.

This gas exchange is crucial for maintaining proper acid-base balance in the body and ensuring that oxygen levels remain adequate for cellular functions. Therefore, the identification of carbon dioxide as the waste gas expelled during expiration reflects an essential aspect of respiratory physiology.