In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction.

What is the simple definition of respiration?

1 : the act or process of breathing : the inhaling of oxygen and the exhaling of carbon dioxide. 2 : the process by which cells use oxygen to break down sugar and obtain energy.

What is the normal respiration?

Normal respiration rates for an adult person at rest range from 12 to 16 breaths per minute.