SKELETAL system

1. SKELETAL system

2. What is the skeletal system • Your Skeletal system is all of the bones in the body and the tissues such as tendons, ligaments and cartilage that connect them. • Your teeth are also considered a part of the skeletal system but there not labeled as bones. • Your teeth are made of enamel and dentin. SOMETHING to know is Enamel is the strongest substance in your body!!

3. The support , movement, protection • The main job of the skeleton is to provide support for our body. Without your skeleton your body would collapse into a heap. Your skeleton is strong but light. Without bones you'd be just a puddle of skin and guts on the floor. • Bones provide the structure for muscles to attach so that our bodies are able to move. Tendons are tough inelastic bands that hold attach muscle to bone. • Your skeleton also helps protect your internal organs and fragile body tissues. The brain, eyes, heart, lungs and spinal cord are all protected by your skeleton. Your cranium (skull) protects your brain and eyes, the ribs protect your heart and lungs and your vertebrae (spine, backbones) protect your spinal cord.

4. What is bone made of? • A typical bone has an outer layer of hard or compact bone, which is very strong, dense and tough. Inside this is a layer of spongy bone, which is like honeycomb, lighter and slightly flexible. In the middle of some bones is jelly-like bone marrow, where new cells are constantly being produced for the blood. Calcium is an important mineral that bone cells need to stay strong so keep drinking that low-fat milk!

5. BONES • Common NameScientific Name • skull cranium • Jawbone mandible • collarbone clavicle • shoulder blade scapula • breast bone sternum • funny bone humerus • spine vertebrae • hips pelvis • wrist carpals • thigh bone femur • kneecap patella • shin bone tibia • ankle tarsals

6. Things to know • When you were born you had over 300 bones. As you grew, some of these bones began to fuse together. The result? An adult has only 206 bones! • With a lot of help. You need muscles to pull on bones so that you can move. Along with muscles and joints, bones are responsible for you being able to move. Your muscles are attached to bones. When muscles contract, the bones to which they are attached act as levers and cause various body parts to move.

7. factoids • The human hand has 27 bones; your face has 14! • The longest bone in your body, Your thigh bone, the femur -- it's about 1/4 of your height. The smallest is the stirrup bone in the ear which can measure 1/10 of an inch. • humans and giraffes have the same number of bones in their necks? Giraffe neck vertebrae are just much, much longer! • You have over 230 moveable and semi-moveable joints in your body

8. Words to know • *HINT THESE WILL PROBABLY BE ON THE TEST!! • Tendons- are tough inelastic bands that hold attach muscle to bone. • Bone marrow- The soft, spongy tissue found in the center of most large bones that produces the white cells, red cells, and platelets. • Vertebra- Any of the bones or cartilaginous segments forming the spinal column. • Cranium-The portion of the skull enclosing the brain; the braincase. • A tough, elastic, fibrous connective tissue found in various parts of the body, such as the joints, outer ear, and larynx. A major constituent of the embryonic and young vertebrate skeleton, it is converted largely to bone with maturation. • Ligament- Anatomy A sheet or band of tough, fibrous tissue connecting bones or cartilages at a joint or supporting an organ.