Chapter 5 Skeletal System

Framework of bone and cartilage that supports and protects the internal organs, movement, serves as storage site for minerals and fats, also production of blood cells.

Provides the rigid framework that supports soft tissues. leg bones and back bone hold our bodies upright, and the pelvic girdle supports the abdominal organs

Provides places of attachment for muscles. contraction of muscles allows bones to move at joints

Shields our internal organs, such as the heart and lungs, which are enclosed within the chest cavity, and the brain, which lies within the skull

stores minerals(calcium and phosphorus), that can be released to the rest of the body when needed.
it stores energy rich fat in yellow bone marrow (soft tissue within some bones). fat can than be metabolized when the energy is needed.

Produces blood cells int he red marrow of certain bones.

1. compact bone2. spongy bone

-outer layer of bone. very dense w/ few internal spaces. -forms most of the shaft of long bones.

-latticework of tiny beams and thin plates of bone w/open areas between. -found in small, flat bones, in the head and near the ends of the shafts of long bones

Microscopic, repeating structural units(concentric circles) in compact bone (structural unit of compact bone)

Mature bone cells found in lacunae that are arranged in concentric rings around the central canal.

A bone forming cell....

Tiny cavity, which holds the osteocyte

The epiphyseal plate, a plate of cartilage which separates each end of the bone from its shaft

Prompts the liver to release growth factors that produce a surge of growth in the growth plate