Respiration is achieved through the mouth, nose, trachea, lungs, and diaphragm. Oxygen enters the respiratory system through the mouth and the nose.The lungs are the main organs of the respiratory system. In the lungs oxygen is taken into the body and carbon dioxide is breathed out.

The red blood cells are responsible for picking up the oxygen in the lungs and carrying the oxygen to all the body cells that need it.

The red blood cells drop off the oxygen to the body cells, then pick up the carbon dioxide which is a waste gas product produced by our cells.

The red blood cells transport the carbon dioxide back to the lungs and we breathe it out when we exhale.

  1. In physiology, respiration is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

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