1. Skeletal and Muscular System BY ADAM, TYLER, CHRISTOPHER AND KENDRICK

2. Skeletal System Functions  Support : Our bones provide the rigidity we need to function  Protection : The rigidity of our bones allow them to protect our internal organs from damage, for example the rib cage and the skull.  Movement : Without the strength of our bones we wouldn’t be able to move our muscles are anchored to our bones.  Storage : Our bones are a storehouse for fat and certain essential minerals.  Blood Cell Formation : Most of our blood components are made in the bones.

3. Skeletal System Cells  Osteongenic Cells : Produce osteoblasts  Osteoblasts : Are bone building cells.  Osteocytes : Are mature bone cells and are the main cells in bone tissue  Osteoclasts : Huge cells derived from monocytes  Resorption : Is the breakdown of the bone

4. Skeletal System Diagram

5. Muscular System  The 650 muscles in the body not only support movement — controlling walking, talking, sitting, standing, eating and other daily functions that we consciously perform — but also help to maintain posture and circulate blood and other substances throughout the body, among other functions.  The nervous system controls the actions of the muscles, although some muscles, including the cardiac muscle, can function independently.  Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other.  The heart’s natural pacemaker is made of cardiac muscle that signals other cardiac muscles to contract.

6. Muscular System Cells  Different types of cells: A) skeletal muscle cell (rhabdomyocyte) - voluntary, affect locomotion  B) cardiac muscle cell (kardiomyocyte) - involuntary, structure is similar to skeletal muscle cell  C) smooth muscle cell (leiomyocyte) - involuntary, walls of organs and in skin

7. Muscular System Diagram