#osseous tissue

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The next time someone says "I'm not fat I'm just big boned": Most adult bones store fat in the form of yellow marrow in the central portion called the medullary cavity (with the exception of a couple places where there's still red marrow like the sternum and pelvic girdle)

[carlsolrac]

Osseous tissue

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The Skeletal System

The entire framework of bones and their cartilages, along with ligaments and tendons

ANATOMY OF THE SKELETAL SYSTEM

Each individual bone in your body is considered an organ

A bone is composed of many tissues, working together:

Bone (Osseous) Tissue

Cartilage

Dense Connective Tissue (CT)

Epithelium

Adipose Tissue

Nervous Tissue

FUNCTIONS OF THE SKELETAL SYSTEM and EXAMPLE

SUPPORT: structural framework of body, attachment for tendons of (most) skeletal muscles

PROTECTION:  vertebrae (backbones) protect spinal cord 

Critical organs, the heart, lungs and brain, are protected by bones

LOCOMOTION: most skeletal muscles attach to bones, contract to produce movement

 Locomotion in humans is pendular

MINERAL HOMEOSTASIS: bones store 99% of body's calcium; release on demand to maintain mineral balances

Calcium allows skeletal muscle contraction and bone rigidity

BLOOD CELL PRODUCTION: red bone marrow in spongy bone is site of hemopoiesis (-hemo "blood" --poiesis "making")

In infants, all bone marrow is red bone marrow

In infants, hemopoiesis occurs in the medullary cavity

In adults, red bone marrow changes into yellow bone marrow with increasing age

In adults, hemopoiesis occurs in the pelvic bones, ribs, sternum, vertebrae, skull, and ends of the humerus and femur

TRIGLYCERIDE STORAGE: yellow bone marrow stores triglycerides (eg in the medullary cavity of humerus) as chemical energy reserve

Yellow bone marrow consists mainly of adipose cells