Introduction:
Breathing and gas exchange are two vital processes that occur in the human body. While breathing is a rhythmic process, the exchange of gases is a continuous process. This statement highlights the difference between the two processes. In this article, we will explain in detail why breathing is rhythmic, and gas exchange is a continuous process.

Explanation:

Breathing:
Breathing is the process of inhaling oxygen-rich air into the lungs and exhaling carbon dioxide-rich air out of the lungs. The process of breathing is rhythmic because it occurs in a repetitive pattern. The respiratory system consists of muscles, lungs, and airways that work together to facilitate breathing. The diaphragm and intercostal muscles contract to increase the volume of the chest cavity, which leads to the entry of air into the lungs. Similarly, the relaxation of these muscles leads to the expulsion of air from the lungs. This rhythmic process continues throughout life.

Gas Exchange:
Gas exchange is the process of exchanging oxygen and carbon dioxide between the blood and the air. This process occurs in the lungs and is continuous because it occurs throughout life. The exchange of gases occurs through diffusion. Oxygen diffuses from the air in the lungs into the blood vessels, while carbon dioxide diffuses from the blood vessels into the air in the lungs. This process occurs continuously because oxygen is constantly being used by the body, and carbon dioxide is constantly being produced by the body.

Difference:
The main difference between breathing and gas exchange is that breathing is a rhythmic process, while gas exchange is a continuous process. Breathing occurs in a repetitive pattern, while gas exchange occurs throughout life. Breathing is necessary to facilitate gas exchange, but gas exchange can occur without breathing (such as during artificial respiration).

Conclusion:
In conclusion, the breathing cycle is rhythmic, while the exchange of gases is a continuous process. Breathing is necessary to facilitate gas exchange, but gas exchange can occur without breathing. Understanding the difference between these two processes is important in understanding the respiratory system and how it works.

Due to metabolism of body, there is generation of co² at the tissue level. This co² in continuously exchange for O². This process of exchange occur at the alveoli of lungs all the time hence exchange of gases is a contionus process