Breathing is a mechanical Process. In breathing, an organism takes in oxygen from its environment and released carbon- dioxide. Breathing involves the transport of oxygen and carbon dioxide between the external environment and the body cells. This process is also called pulmonary respiration.
Breathing is the physical process of inhaling oxygen and exhaling carbon dioxide. The mechanism of breathing involves two main processes: inspiration and expiration. Inspiration occurs when the diaphragm and the external intercostal muscles contract.
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