Applied lifecare - The Respiratory System

Gapfill exercise

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We all need oxygen to release the energy from food inside our cells. The process is called . Molecules of ATP (adenosine triphosphate) are formed in respiration.
About 21% of the air is .
First, air passes down the airways. Air passes through the nasal cavity or mouth cavity, down the into the and finally the . Inside the lungs, at the end of each bronchiole are many tiny air sacs called .
In the alveoli, gas exchange allow to enter your body and to leave. The passes into the circulatory system which delivers it around the body. Oxygen is carried by the . is carried as a dissolved gas in the . It passes through the alveoli walls so it can be breathed out.
In order to take new air into our lungs and get rid of the exhaled air, we have to breathe. Our ribcage moves because the intercostal muscles contract, and the diaphragm moves to make us breathe in. To exhale, our ribs move , and the diaphragm moves to push the air out.