muscular system

Explains how the human skeleton supports the rest of the body and protects the inner organs and how the muscles help the body to keep its balance, and describes the different muscles and bone shapes and how to properly care for them.

Describes the human skeleton, major muscles of the body, the internal composition of bone, and the process of muscular contraction.

Simple text, photographs, and diagrams introduce the muscular system and its purpose, parts, and functions.