From our childhood we are studying that we breathe in oxygen and exhales carbon dioxide. But have you ever thought that why we breathe in oxygen ? Why not we breathe in other gas ?
Have ever this question came in your mind ? If yes then ever ever you asked anyone ? Many of you may have asked this question from your teacher but he would have told you to stop talking rubbish and would have told you ask question from book.
Everyday many important functions happens in our body which are important for our life and survival, digestion of food, movement of muscles, exrection, or even just for thinking, our body need oxygen.
The respiratory and digestive systems functions together to provide required energy to the body. A properly functioning respiratory system delivers required oxygen to the blood. Because the digestive system breaks down food and uses muscular contractions to deliver food through the digestive tract, it needs oxygen to function properly.
Brain also has a important role in this respiration process as it controls your breathing rate to maintain the oxygen level in your body. You must have experienced that sometime you breathes rapidly and sometime at a normal rate, this happens because of unequal requirement of oxygen of body.
When we do exercise our heart beat rate , breathing rate increses. Do you know why? Because our muscles need more energy to function properly and oxygen has a significant role in formation of energy in our body. And to make this function long lasting our lungs starts breathing heavily to fulfil oxygen requirement and our heart starts beating fast to pump required oxygen faster throughout the body.
When we think about something our brain requires a large amount of oxygen to function properly. Oxygen levels and brain functions are dependent on each other. Having enough oxygen in the brain is very important for it to function properly, and for body also. The brain always need sufficient supply of both oxygen and energy. With low oxygen levels in blood, the brain will face problems in signaling where to send blood to drowsy and oxygen lacked muscles or tissues and where to not. This lack of oxygen and energy leads to fainting of an individual many times.
Till now you must have understood that why Oxygen has so much importance.
When these processes occurs, as called carbon dioxide is produced as a waste product from our body. The work of our lungs is to provide our body sufficient oxygen for metabolic processes and to get rid of the waste gas from our body.
Now, the final answer is our body is formed in that way that it requires oxygen for its every function like movement , digestion , respiration etc. And to fulfil the requirement of oxygen for these processes we breathe oxygen from our environment.
