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In human beings, oxygen is inhaled inside the human body through nose or mouth. Oxygen is transferred to the entire body and enters the cell. Inside the cell food particles are broken down into smaller pieces in the presence of oxygen. During the breakdown of food particles, energy is released in the form of ATP. This energy released is utilized in certain metabolic activities.

Respiration equation:

Anaerobic

Breathing:

Breathing is a process in which air moves inside the body and outside the body.

It consists of two phase:

Inhalation
Exhalation

Inhalation: Air enters the body of a living organism in this process.

Exhalation: In this process, air is released outside the body of a living organism.

Breathing rate: It can be defined as the number of times a person can breathe in a minute. With the increase in physical activity the breathing rate increases.

The above figure shows the respiration process. In this process, oxygen-rich air enters the body through the nose. From nose, it is transferred to trachea through pharynx and larynx where primary filtration of air takes place. From trachea, air is transferred to the bronchioles in the lungs. Bronchioles are the passageways to the alveoli.