Charles Manderi

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- Helping others is not only good for them and a good thing to do, it also makes us happier and healthier too. Giving also connects us to others, creating stronger communities and helping to build a ...

In order for blood to provide oxygen to the body, the body must have a way of obtaining that oxygen. The respiratory system allows air to enter the lungs and for oxygen to diffuse into the blood en route to the body's tissues. The entrance to the respiratory system can be found in the nose and the mouth, where air enters the body and then travels through the larynx and pharynx in the throat to the trachea or windpipe. From the trachea, right and left branches, known as bronchi, carry oxygen to the alveoli, where oxygen moves into the blood, while carbon dioxide moves into the lungs to be exhaled. The alveoli are the smallest parts of the respiratory system and deal specifically with exchange of gases, like traders at a market. For example, they receive goods, like oxygen and carbon dioxide, from other sources and then trade them in the lungs. In the following illustration, you'll find the major organs of the respiratory system, as well as an illustration of gas exchange in the alveoli on the left.