Life Science : 1.2

The Skeletal System

1. Identify the major organs of the skeletal system.

2. Describe four functions of bones.3. Describe three types of joints.4. List three injuries and two diseases that

affect bones and joints.

Objectives:

Bones, cartilage, and the connective tissue that holds bones together make up your skeletal system.

Bone Structure Bone tissue without any visible open spaces is called

compact bone. Bone tissue that has many open spaces is called spongy

bone. Bones contain a soft tissue called marrow.

Bone GrowthMost bones start out as a flexible tissue called cartilage. Eventually, most cartilage is replaced by bone.

Bones

4 functions of Bones

Joint Place where two or more bones meet.

Joints are held together by ligaments.

JointsThree Joints:

Bones may be fractured or broken.Ligaments can be stretched or torn.Arthritis is a disease that causes the joints

to swell or stiffen.Osteoporosis is a disease that causes

bones to become less dense.

Skeletal System Injuries and Diseases