Answer: All animals need ___oxygen_____________ to make energy from food. We get this oxygen from the __air__ that we breathe. In order to get the oxygen into the blood where it can be transported to the rest of the body, the air travels through a system of organs called the ____respiratory___________ system.
When you ____yawn____________, air enters the body through the ____mouth___________ or the ___nose_________. From there it passes through the ____diaphragm__________, which forces air into the _______________ and food into the esophagus. The air travels down the trachea into two branching tubes called __trachea______________ and then on into the __pharynx______________.
In the lungs oxygen from the air enters the ___blood____________. At the same time, the waste gas ___water vapor_________________ leaves the blood and then leaves the body when you ___exhale ________________. Some ___carbon dioxide_______________ also leaves the body when you exhale, which is why mirrors get foggy when you breathe on them. The __bronchi____________ is the muscle that controls the lungs.
It is important to keep the respiratory system clear so oxygen can keep flowing into your body. If something gets in your nose and irritates it, you ___sneeze_______________. If something gets in your trachea or bronchi and irritates it, you ____cough_____________. If something irritates your diaphragm, you ____yawn_____________. Finally, if the brain thinks you are not getting enough oxygen, then it forces you to ___hiccup______________.
Explanation:
