13.2 The Skeletal system

Functions of the Skeletal system 5 major functions: Provides shape and support Enables you to move Protects your organs Produces blood cells Stores minerals and other materials until your body needs them.

Shape and support Skeleton determines the shape of your body Vertebral column (backbone) is the center of the skeleton

Movement and protection Your skeleton allows you to move. Muscles pull on the bones to make the body move. Bones protect the organs : brain, heart, lungs Production and storage of substances Makes blood cells Stores minerals such as calcium and phosphorus

Joints of the skeleton Joints allow bones to move in different ways. Some joints do not move – immovable joints (skull) Movable joints Hinge joints Ball and socket joint Pivot joint Sliding joint

The bones in movable joints are held together by strong connective tissues called ligaments. Cartilage, another connective tissue, covers the ends of the bones and keeps them from rubbing against each other.

Bones- Strong and Living Bones grow and develop

Taking care of your bones Diet: Calcium and phosphorus – keeps the bones strong Dairy products, green vegetables Exercise: moving around makes your bones stronger and denser

Osteoporosis: a condition in which the body’s bones become weak and break easily.