Section 2

Skeletal System

• The human skeleton is composed of the axial skeleton (skull, ribs, spine, and sternum) and the appendicular skeleton (arms and legs, scapula, clavicle, and pelvis).

• Bones support muscles, give structure to the body, protect organs, store minerals, and make blood cells.

• Most bones develop from cartilage through a process called ossification.

• The human body has three types of joints: fixed joints, semimovable joints, and movable joints. The joints can be affected by a disease called arthritis.

Vocabulary skeleton (p. 911) axial skeleton (p. 911) appendicular skeleton (p. 911) periosteum (p. 912) compact bone (p. 913)

Haversian canal (p. 913) osteocyte (p. 913) spongy bone (p. 913) bone marrow (p. 913) fracture (p. 913)

ossification (p. 914) epiphyseal plate (p. 914) joint (p. 915) fixed joint (p. 915) semimovable joint (p. 915)

movable joint (p. 915) ligament (p. 915) synovial fluid (p. 915) rheumatoid arthritis (p. 916) osteoarthritis (p. 916)

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