--- title: The skeleton and muscles — a lesson of Mova's school · trees and pragmatics description: «The skeleton and muscles», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Inside your body is a frame of bones called the skeleton; an adult has 206 bones. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/) [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/) / The skeleton and muscles # The skeleton and muscles Lesson 31 of the world course of Mova's primary school: 19 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/31-skeleton-and-muscles/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/0/) — Inside your body is a frame of bones called the skeleton; an adult has 206 bones. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/1/) — The skeleton holds you up, gives your body its shape and protects soft parts: the skull guards the brain and the ribs guard the heart and lungs. - [2](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/2/) — Bones are alive: they grow, they mend when they break, and inside many of them soft marrow makes new blood cells. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/3/) — Where two bones meet there is a joint, such as the knee, the elbow or the shoulder, which lets the body bend and turn. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/4/) — Muscles move the bones. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/5/) — A muscle can only pull, never push, so muscles work in pairs: when you bend your arm the biceps at the front pulls, and to straighten it the triceps at the back pulls. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/6/) — Your heart is a muscle too, and it works all your life without you thinking about it. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/7/) — An adult skeleton has 206 bones. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/8/) — A baby is born with about 300 bones, and some of them join together as it grows. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/9/) — The skull protects the brain. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/10/) — The ribs protect the heart and the lungs. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/11/) — The backbone (spine) is a column of small bones that holds the body upright and protects the spinal cord, the thick bundle of nerves running down your back. - [12](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/12/) — A joint is the place where two bones meet. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/13/) — Muscles are joined to bones by tough cords called tendons. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/14/) — A muscle can only pull; it cannot push. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/15/) — The biceps bends the arm and the triceps straightens it. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/16/) — Bone marrow inside many bones makes blood cells. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/17/) — The longest bone in the body is the thigh bone (femur). - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/31-skeleton-and-muscles/18/) — Bones need calcium, from foods like milk, cheese and green vegetables, to stay strong. - ← previous: [Balance in a food web](https://md.mova.elamur.ai/free/en/corpora/school/world/30-balance-in-food-webs/) - next →: [The heart, blood and breathing](https://md.mova.elamur.ai/free/en/corpora/school/world/32-heart-blood-breathing/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)