Theory:

Introduction:
We all play and perform certain physical activities like exercises, running, jogging, walking, etc. However, once we stop, we notice that we will be breathing heavily. Have you ever wondered that why are we breathing heavily at times like these? To know this, first, we have to know that why are we breathing? Breathing is part of the process of respiration. In this topic, we shall discuss the process of respiration.
What is respiration?
Respiration is a process through which all living organisms derive their energy from food. The air we breathe contains oxygen, and the air we breathe out contains carbon dioxide. The oxygen we breathe is transported to all the cells found in the body.
The process in which the oxygen in the air helps to break down the food to release energy is known as cellular respiration.
The process of cellular respiration takes place in the mitochondria of the cells. Hence they are known as the 'powerhouses of the cell'.
 
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Importance of respiration:
All living organisms are made up of cells, and the smallest structural and functional unit of an organism is known as a cell.
The cells are considered functional units as they perform various functions such as nutrition, transport, excretion and reproduction. The cells perform these functions with the help of energy. For example, we require energy to eat, sleep, read and listen.
Have you ever wondered that from where do we get this energy?
The food we eat contains stored energy, and through respiration, the stored energy is released out.