The Skeletal System

1
The Skeletal System

• Every movement is possible because of the muscles
  working with the bones skeletal system.
• Functions of the Skeletal System
• 1. Anchor for bodys movement
• 2. Provides support
• 3. Protects soft organs inside the body.

2
Classification of Bones

• Long bones arms and legs
• Short bones feet and hands
• Irregular bones spine
• Flat bones ribs and skull

3
What are Bones Made Of???

• Bones are made of soft and hard material
• Are living tissue
• They have spaces inside allow blood and
  nutrients to pass through

4
Two Types of Bone Tissue

• Compact Bone Outside of the bone
• Supportive tissue of the body
• Is the part we call the skeleton
• Spongy Bone Tissue inside the bone
• Strong, but lightweight

5
Marrow and Blood Cells

• Marrow inside the spongy bone tissue, produces
  blood cells
• The blood brings nutrients to the bone cells and
  carries waste materials away.

6
Two Main Divisions in the Skeleton

• Axial Skeleton Central part of the Skeleton
• Forms the axis
• Provides support and protection
• Includes the skull, spinal column, ribs
• Appendicular Skeleton attached to the axis
  skeleton.
• Allows movement
• Shoulder, legs, arms, knees, etc.

7
The Skeleton Changes as We Grow

• Infancy Skull is made up of several bones that
  have spaces between them The spaces gradually
  grow together.
• Childhood Bone growth occurs at growth plates,
  a flexible, firm connective tissue. The length
  and shape of bones is determined by growth
  plates.
• Adolescence Bones stop growing at the end of
  adolescence the growth plate becomes hard, then
  arms and legs stop growing and the skull plates
  fuse together.
• Adulthood As people age, more bone is broken
  down than is formed. Bones become less dense and
  can break more easily.

8
Joints Connect Parts of the Skeletal System

• Joint A place at which two parts of the
  skeletal system meet.
• Three Types of Joints
• Immoveable locks bones together like puzzle
  pieces. Ex bones of skull
• Slightly moveable enables you to flex slightly.
  Ex ribs connected to sternum
• Freely Moveable joints that allow your body to
  bend and to move. Ligaments hold the bones
  together at moveable joints.

9
Ligaments Tendons

• A ligament is a strong, flexible band.
• A ligament links or connects bones together.
• A tendon is a cord made of tough, white tissue
  that attaches muscles to bones.
• A tendon connects muscles to bones.