Skeleton

Take a look at yourself in the mirror. You will see that you can stand upright. Do you know why?

Human can stand upright because there is skeleton inside his body. Human skeleton is located inside the body and covered with muscle (flesh) and skin, therefore it called internal skeleton (endoskeleton). Muscle covering the skeleton move the bones so that we can move.
Some animals have skeleton on the outside of their body, it is called external skeleton (exoskeleton); the examples are crab, grasshopper, and shrimp. However, in this chapter, we will only learn about human skeleton.
Human skeleton is devided into three parts, namely skull, body skeleton, and axtremities skeleton.

Science focus. 2009. Science for elemetary school year IV. Bogor: PT Yudhistira.
resumed by danar