'Breathing cycle is rhythmic whereas exchange of gas is a continuous process''. Justify this statement.

Breathing cycle is rhythmic because it is a regular process of inspiration and expiration in an oscillating cycle. Neuronal impulses are responsible for this control which transmits between the respiratory centers in the brain and the muscles involved in inspiration in the chest and diaphragm.

Gaseous exchange is a continuous process because it involves the process of diffusion. Diffusion of gas takes place from the region of high concentration to a region of low concentration which normally involves exchange of oxygen and carbon dioxide during the process of respiration in living organism and its environment.

Breathing is a part of the whole process of reputation. Respiration is the production of energy in the body, which includes breathing, mastication etc.

Breathing is rhythmic. It is the intake of oxygen and expulsion of carbon dioxide. It can be controlled and stopped by us, unlike respiration in which energy in the form of glucose is made continually and involuntarily.