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Skeletal System

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Rachel Wortman

on 28 August 2014

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Transcript of Skeletal System

Skeletal System
Job of the System
The main job of the skeletal system is to maintain body shape. Without your bones, tendons, ligaments, and cartilage, your body would have no framework. The rigid bones maintain its shape and protect vital organs and tissues.
Why We Need It
Blood Cell Production
Your skeleton protects your internal organs and tissues. For example, the ribs and sternum protect your heart and lungs. In addition, your skull protects the brain.
The skeleton is in charge of storing important materials for the body like minerals and lipids. The main mineral stored in bones is calcium.
Bones allow for the growth of skeletal muscles which attach by tendons to make a lever for bones, creating movement.
Blood Cell Production
The red bone marrow creates red blood cells, platelets, and most white blood cells. Red blood cells bring oxygen to tissues to exchange for carbon dioxide. Platelets aid in blood clotting. White blood cells fight disease and infection.
It is a flexible connective tissue that is thick and slippery for coating the ends of bones where they meet to form a joint.
Tendons are found in connective tissue. They are located at the origin and insertion points of skeletal muscle.
Cord of fibrous tissue that connects bones
Long - longer length than width; example: humerus of arm

Short - equal length and width; mainly provide stability; example: carpals of wrist

Flat - protect fragile organs; example: parietal bone of skull

Irregular - have no uniform or shape; example: vertebrae
Classification of Bone Tissue
Compact Bone
- densely packed tissue, forms the extremely hard exterior of bones

Spongy Bone
- light, porous bone with lots of empty space; provides support and flexibility

Bone Marrow
-in the middle of some bones where new cells are produced

- cells that make up bone tissue
Bones support and anchor all soft organs.
For example, leg bones support us as we stand and the rib cage supports the thoracic wall.
The Skeleton in divided into 2 parts.
Axial Skeleton- bones forming longitudinal axis of the body (skull, vertebral column, and bony thorax)
Appendicular Skeleton- bones of the limbs and girdles
attach muscle to bone
206 bones make up the skeletal system
Bone cancer
Paget's disease
Joints have 2 main functions.
1. Joints hold bones together firmly

2. Give the human skeleton the ability to move
Bone thinning disease that causes bones to become fragile and weak
Afflicts half of women over 65
A disease that causes damage and inflammation to joints
pg 167
affects children who lack in vitamin D
causes soft and weak bones
Bone Cancer
an abnormal growth of cells in the bone
could start as just a tumor
Paget's Disease
Causes bone to weaken, resulting in enlarged or misshapen bones, fractures, and arthritis in the joints
abnormal curving of the spine
of bone
localized - effects just one or few bones
"Skeletal System." Skeletal System. N.p., n.d. Web. 26 Aug. 2014.

(Marieb, Essentials of Human Anatomy & Physiology)

"Bone Cancer." Definition. N.p., n.d. Web. 26 Aug. 2014

"Skeletal." System Anatomy, Diagram & Function. N.p., n.d. Web. 26 Aug. 2014.

"Skeletal System." Human Anatomy RSS. N.p., n.d. Web. 25 Aug. 2014.
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