Define breathing and explain the mechanism of breathing in human being.

A physical process by which oxygen is taken in and carbon dioxide is given out is called breathing.

Steps of breathing:

  1. Ribs get moved up when we breathe in and flatter-r the diaphragm due to which the chest cavity becomes larger. Hence, the air is sucked into the lungs and fills the expanded alveoli.
  2. Haemoglobin binds with the oxygen and carries it along the blood in the body. Oxygen from the blood diffuses into the cell as the blood moves through the tissues.
  3. Carbon dioxide which is produced during respiration diffuses into the blood and is carried to the lungs for expiration.
  4. Ribs move down and diaphragm becomes dome-shaped decreasing the chest cavity. Thus, pushing the air out from lungs.

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