How does the body use oxygen?

1 Answer
Feb 1, 2016

Oxygen is carried to various cells in our body trough haemoglobin in blood


               Oxygen enters our body through respiration. The blood in alveoli of lungs absorbs oxygen from the air entering these  during inhaling.
             Hemoglobin in blood combines with oxygen to form oxyhemoglobin. The blood is now called oxygenated or pure blood in layman's language.
             The oxygenated blood is carried through arteries to various organs of the body. 
             The cells absorbs oxygen from blood in the capillaries, used in internal respiration to generate energy and carbon dioxide given out during internal respiration is taken up by blood. 
             Hemoglobin in blood is converted into deoxyhemoglobin and the blood is termed deoxygenated blood.
             The deoxygenated blood is carried back to the lungs by veins.
              Carbon dioxide is released in the lungs and comes out during exhalation of air. Haemoglobin again combines with oxygen entering lungs during inhalation of air to form oxyhemoglobin.
            In this way the blood continues circulating through our body to make oxygen available to all cells in our body needed for cellular respiration that provides energy to the cells for various metabolic activities.