Why ? "Internal respiration is called a physico- chemical process . ... In this, exchange of O2 of blood and CO2 of the cells takes place by diffusion ( physical process ) and glucose is aerobically oxidised by oxidative phosphorylaiton to produce energy ( chemical process).

Why respiration is a physical process?

During this process carbon dioxide is released as a by-product. This process is called respiration. Breathing may be defined as the process of taking in oxygen from the environment and giving out carbon dioxide So, breathing is just a physical process in which no energy is released.

Is respiration a physical process?

Breathing and respiration are two completely different but interrelated body processes which assist body organs to function properly. Breathing is the physical process of exchanging gases whilst respiration is a chemical process which takes place at a cellular level and produces energy.