9 Enable movement The skeleton allows you to move Most of the bones are associated with musclesThe muscles pull on the bones to make the body move
10 Enable movement continued… What is a JOINT?A place where two bones cometogetherAllows bones to move in differentways
11 Enable movement continued… Two Types of JointsIMMOVABLE JOINTS- allow little or no movement
12 Enable movement continued… Two Types of JointsMOVABLE JOINTSMake up most of the joints in the bodyAllow the body to make a wide range of movementsHeld together by strong connective tissue call LIGAMENTS
13 Enable movement continued… Two Types of JointsCARTILAGE is a more flexible type of connective tissue that covers the ends of bones to keep them from rubbing against each other
14 Enable movement continued… Two Types of Joints
15CHECK POINT Q. How are movable joints held together? A. With strong connective tissue called ligaments
16Why didn't the skeleton cross the road? It didn't have the guts!What do you call a skeleton who won't work?Lazy bones!
17 Enable movement continued… Types of Movable Joints Enable movement continued…Hinge Joint – allows forward and backward motionExample: knee and elbow
18 Enable movement continued… Types of Movable Joints Enable movement continued…Ball-and Socket Joint – allows the greatest range of motionExample: shoulder and hips
19 Enable movement continued… Types of Movable Joints Enable movement continued…Pivot Joint – allows one bone to rotate around anotherExample: neck
20 Enable movement continued… Types of Movable Joints Enable movement continued…Gliding Joint – allows one bone to slide over anotherExample: wrist and ankle
21Protect the organs Bones protect most organs in the body Example: breastbone and ribs form a cage around the heart and lungs
22Produce blood cellsBlood cells are produced in marrow located in long bones like the legs and armsThe process is known as hematopoiesisProduces approximately 500 billion blood cells per day
23Store minerals and other materials until needed by the body Stores calcium, phosphorus, and other mineralsReleases small amounts into the blood when needed
24CHECK POINT Q. What part of the bone produces blood cells? A. The marrow.
25What smells the best at dinner? Your nose!Why is your nose in the middle of your face?Because it is the scenter!
26Bone StructureBones are complex living structures that undergo growth and development
27Bone StructureA thin, tough membrane covers all of the bone except the endsBlood vessels and nerves enter and leave the bone through the outer membrane
28Bone Structure Compact bone layer just below the membrane Hard and dense but not solidContains small canals for blood vessels and nerves
29Bone Structure Spongy bone Layer just below the compact bone Has small spaces within itCan also be found at the end of bonesLightweight but strong
30Bone Structure Marrow Soft connective tissue Two types: red and yellow Red marrow – produces blood cellsYellow marrow – stores fat for energy reserve
32CHECK POINTQ. What does red marrow do?A. Produces blood cells.
33CHECK POINTQ. What does yellow marrow do?A. Stores fat for energy.
34THINK DEEPERQ. Short bones, like those in the fingers are mostly spongy bone. Why do long bones have more compact bone?A. Long bones have compact bone because they are used to support the body and need to be stronger.
35Taking Care of Your Bones DietEat well-balanced dietExerciseWeight-bearing activities help bones grow stronger and denser
36OsteoporosisA condition in which the body’s bones become weak and break easily