Skeletal System

Bones are living tissue Three main Functions: Support (What would you look like without bones?) Protect Internal Organs Movement Bones are the strongest connective tissue. There are 206 bones in adult humans

Two Types of Bone Tissue Compact Bone: Found on the out side of the bone. Layer is very hard and tough. It covers the outside of most bones. Spongy Bone: Found in side the bone Strong and lightweight Made of a calcium network. Contains bone Marrow: where red blood cells are made.

Your Skeleton is Divided Into Two Sections: Axial Skeleton Forms the axis Provides support and protection Includes: skull, ribs, and vertebrae Appendicular Skeleton Function to allow movement Includes: femur, tibia, fibula, humerus, ulna, radius, and scapula

Skeleton Development Infancy Childhood Adolescence Adulthood Contain more bones The skull is made up of several bones to allow for growth. Bones have more space between each other. Childhood Growth occurs at areas called growth plates Long Bones grow at their ends Adolescence At the end of adolescence bones stop growing. The growth plate is the last portion of the bone to become hard. Adulthood Old bone is broken down and new bone is formed. As people get older, more bone is broken down than formed. This can lead to fragile bones and cause the likelihood of a broken bone to occur.

How can I move? Joints and Ligaments. Joint: Where two or more bones meet Ligament: attach bones at the joins

Types of Joint Ball and Socket- Hip and Shoulder Hinge- elbow and knee Pivot- Head and arms Immovable- Skull Gliding- Wrist and Spine