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Middle School MS Summer Science

Skeletal System

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This book developed by ©Academy Global Learning 2020
All rights reserved under ©Academy Global Learning 2020. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright owner.

Designed By:
Christian Alas
Created and illustrated By:
Angelo Romero and Camilo Sanabria

Skeletal System

The skeletal system is made up of bones, ligaments, and tendons. Ligaments connect bones to each other. Tendons connect muscles to bones.

The skeletal system provides many important functions for our bodies. The skeletal system provides support to hold up our bodies and everything inside them. It gives our bodies the shape and form that it has and allows us to keep that shape.

The skeletal system also works with the muscular system and enables our bodies to move. Another very important function of the skeletal system is that it provides protection for our internal organs.

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The cranium protects the brain. Our ribs and our sternum protect our heart and our lungs. An important function that the skeletal system provides that many people do not know is that it produces blood for the body and stores minerals. Bone marrow creates red blood cells, white blood cells, and immune system cells.

There are five types of bones in the skeletal system. There are long bones, short bones, flat bones, sesamoid bones, and irregular bones. The bones that are longer than they are wide are called long bones. The humerus and femur are long bones.

Short bones are bones that are as wide as they are long. The carpals and tarsals found in the wrist and the foot are examples of short bones. Flat bones are bones that are meant to protect or have flat surfaces that provide a place for muscles to attach

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Flat bones come in flat plates. Some flat bones are the skull, pelvis, sternum, scapula, and rib cage. Sesamoid bones are bones that are in the middle of a tendon. An example of a sesamoid bone is the patella.

Irregular bones have a funny shape and so they do not fit in any of the other types of bones. The vertebrae, mandible, and coccyx are irregular bones

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READING QUESTIONS

1. What is the writer’s main idea?

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2. What example supports the writer’s main idea?

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3. How does the example help the writer’s argument?

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4. What do you think about the story?

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