--- title: Lungs, air and keeping fit — a lesson of Mova's school · trees and pragmatics description: «Lungs, air and keeping fit», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: The air you breathe in is about one fifth oxygen; most of the rest is nitrogen, which your body does not use. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Lungs, air and keeping fit # Lungs, air and keeping fit Lesson 93 of the world course of Mova's primary school: 20 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/93-lungs-air-keeping-fit/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/0/) — The air you breathe in is about one fifth oxygen; most of the rest is nitrogen, which your body does not use. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/1/) — The air you breathe out has less oxygen and more carbon dioxide. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/2/) — To breathe in, the diaphragm under your lungs tightens and moves down and your ribs move up and out; the chest gets bigger and air rushes in. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/3/) — When they relax, air is pushed out. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/4/) — Your nose and windpipe clean the air: hairs and sticky mucus trap dust and germs, and tiny moving hairs sweep the mucus up so you swallow or cough it away. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/5/) — When you run, your muscles need much more oxygen, so you breathe faster and deeper and your heart beats faster to carry it. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/6/) — Regular exercise makes the heart stronger, so it pumps more blood with each beat. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/7/) — Example: a fit person's pulse may be slower at rest and goes back to normal quickly after a race — so how fast you recover is a good test of fitness. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/8/) — Air is about one fifth oxygen and nearly four fifths nitrogen. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/9/) — Breathed-out air contains less oxygen and more carbon dioxide than breathed-in air. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/10/) — When the diaphragm tightens and moves down, the chest gets bigger and air flows into the lungs. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/11/) — Hairs and sticky mucus in the nose and airways trap dust and germs. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/12/) — During exercise we breathe faster and deeper to get more oxygen to the muscles. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/13/) — During exercise the heart beats faster to carry more oxygen to the muscles. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/14/) — Regular exercise makes the heart stronger, so it pumps more blood with each beat. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/15/) — A fit person's heart rate returns to normal quickly after exercise. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/16/) — In asthma the airways become narrow, which makes breathing hard; an inhaler helps to open them. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/17/) — High up on mountains the air is thinner, so each breath brings in less oxygen. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/18/) — After some weeks high on a mountain, the body slowly gets used to working with less oxygen. - [19](https://md.mova.elamur.ai/free/en/corpora/school/world/93-lungs-air-keeping-fit/19/) — Smoke and polluted air damage the lungs. - ← previous: [The human life cycle and growing up](https://md.mova.elamur.ai/free/en/corpora/school/world/92-human-life-cycle/) - next →: [Medicines, doctors and hospitals](https://md.mova.elamur.ai/free/en/corpora/school/world/94-medicines-doctors-hospitals/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)