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RESPIRATORY SYSTEM BASICS Chapter 3 Lesson 3 Where it begins The respiratory process begins in the mouth and nose. The mouth and nose both use filter systems to clean the air before entering the lungs. Air is also warmed up before entering the lungs. Air is warmed up so your body temperature stays normal. Cold air = cold body temperature. What comes next? The air then moves through the throat into the windpipe (trachea) The trachea is made up of cartilage rings. These rings protect your airway! 15-20 cartilage rings line your windpipe. Entering the lungs… The air enters the lungs through the bronchi. The bronchi then split into bronchioles. Bronchioles then split further until become alveoli. Your lung contains over 150 million alveoli. Gas exchange (putting oxygen back into the blood) happens at the alveoli. The Breathing Process Inhaling and exhaling are made possible by the diaphragm. Diaphragm: a thin, dome-shaped muscle that divides the chest from the abdomen. When you inhale, the diaphragm contracts and drops down, letting air into the lungs. When you exhale, the diaphragm relaxes and pops up, forcing air out of the lungs. Without the respiratory system… Our hearts would not beat. We would not be able to talk! The respiratory system allows us to talk. Air passing by organs causes vibrations which creates sound. This sound is our voice. You could have brain damage. When the brain does not get oxygen, it shuts down. Your body wouldn’t function. Respiratory System Facts Hairs in the nose help to clean the air we breathe as well as warming it. The highest recorded "sneeze speed" is 165 km per hour or 102 mph. The surface area of the lungs is roughly the same size as a tennis court. More Facts! We lose half a liter of water a day through breathing. This is the water vapor we see when we breathe onto glass. A person at rest usually breathes between 12 and 15 times a minute. Yawning brings more oxygen into the lungs.