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Skeletal System

Andrew Fox & Amanda Ceide; period 4

Andrew Fox

on 15 May 2013

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Transcript of Skeletal System

Skeletal System Andrew Fox
Amanda Ceide Support: The skeleton provides structural support for the entire body What are the functions? Muscular system
The interaction between the skeletal system and the muscular system is so constant that sometimes the two organ systems are referred to as one system; the musculoskeletal system. Skeletal muscles must be attached to something at either end to give them support while they contract. Typically this means each end of a skeletal muscle is attached to a bone. How does it work with
other body systems? Circulatory System
Marrow is created inside bones and aids the production of red and white blood cells. The circulatory system is the system that circulates the red and white blood cells through the body. Red and white blood cells are necessary for the body to function properly, and these cells couldn't be circulated through the body unless the bones of the skeletal system first created marrow. Digestive system
Although your teeth are not considered bones, they are counted as part of the skeletal system, and play a key role in the digestion process. The digestive system helps the skeletal system also, by providing calcium and other nutrients that are much needed by your bones to stay healthy. How does it work with
other body systems? Protection: Surrounds soft tissue- ex. ribs and sternum protect the heart and lungs, - skull protects the brain Movement: Skeletal muscle is attached to bone so it pulls on the bone when it contracts Mineral Homeostasis: stores calcium and phosphorus--minerals are released into the blood when needed Blood cell production: red bone marrow produces red blood cells, white blood cells and other blood elements Storage: storage of minerals and lipids(fats)---yellow marrow stores fat --(found in long bones) We are born with about 350 bones, but by the time we reach adulthood we have only 206 due to bones fusing together. Fun Facts How does it work with
other body systems? Structure of the Skeletal System Out of all 206 of our bones as adults, more than 25% of them make up just our feet! (52 of them) The structure of the skeletal system consists of all the bones of the body and the cartilage, tendons and ligaments that join them together. It can also be divided into the head, torso and limbs. The bones of the head include the skull and jaw and excludes the teeth, which are not considered bones due to their different make-up. The torso consists of the ribcage, shoulder blades and spine and ends at the pelvic bones and shoulders. The limb bones are the arm and leg bones, attached to the shoulders and pelvic bones and ending in the fingers and toes. Humans and giraffes have the same number of bones in their necks. It is just that giraffes have a much longer vertebra. Our bone is six times stronger than steel if both are of the same weight. Long bones have greater length than width and consist of a shaft and a variable number of endings (extremities). They are usually somewhat curved for strength.

Examples include femur, tibia, fibula, humerus, ulna and radius. Flat bones have a thin shape/structure and provide considerable mechanical protection and extensive surfaces for muscle attachments.

Examples include cranial bones, the sternum and ribs, and the scapulae (shoulder blades). Irregular bones have complicated shapes and so cannot be classified into other categories. Their shapes are due to the functions they fulfill within the body such as providing major mechanical support for the body yet also protecting the spinal cord (in the case of the vertebrae).

Examples include the vertebrae and some facial bones. Sesamoid bones develop in some tendons in locations where there is considerable friction, tension, and physical stress.

An example would be the patellae (kneecaps). 5 main
categories of bones Long Bones Short bones are roughly cube-shaped and have approximately equal length and width.

Examples include ankle and wrist bones. Short Bones Flat Bones Irregular Bones Sesamoid Bones The skeleton is divided into two groups
The Axial skeleton and the Appendicular skeleton, each with it's own purpose. Axial Skeleton Appendicular
Skeleton Two groups of bones The Axial skeleton makes up 80 of your 206 bones and includes all of your upper body bones. It is subdivided into three groups:
The skull, the vertebral column, and the bony thorax. It's main purposes are to protect your vital organs, such as the brain, heart, and lungs, and to provide an efficient structure to preform a variety of work. The Appendicular skeleton refers to your arms and legs. They are called appendicular (think "appendages") because they are attached by girdles, which bridge each with the main body. These girdles give appendages a remarkable range of movement unique from anywhere else in the body. And that's the
Skeletal System
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