1. Bones & Muscles

3. How many bones does the human skeleton contain?

4. 206

5. Functions of the skeletal system
Gives shape & support
Protects internal organs
Moves muscles
Produces blood cells
Stores calcium and phosphorous

6. Bone Cross Section Marrow: manufactures red blood cells
Periosteum: soft, thin layer- covers and protects the bone
Compact Bone: Hard, outer surface. Can heal itself when broken
Spongy Bone: Porous, contains blood vessels, nerves
Marrow: manufactures red blood cells

9. Skeletal System
is divided into
two parts

10. Axial Skeleton Skull (protects the brain).
Ribs ( protect lungs, and heart).
Spinal column (houses and protects the spinal cord).

11. Appendicular Skeleton
Legs
Pelvis
Arms
Shoulders

12. Types of Joints Immovable Movable Skull Pelvis Pivot Ball & socket
Hinge
Gliding

14. Types of Joints Ball and Socket Joint
Bone with a rounded end that fits into a cuplike cavity on another bone

15. Ball & Socket: Shoulders and Hips
Allows arms and hips to move in any direction
Can move in a full 360 degrees

16. Types of Joints Pivot Joint
One bone rotates in a ring of another bone that does not move

17. Pivot Joints: First two neck vertebrae & joint beneath elbow
Moves in a semicircle motion by twisting against each other

18. Types of Joints Hinge Joint
Back-and-forth movement like hinges on a door

19. Hinged: Elbows & Knees Move like hinges on a door Limited movement
Can only swing back and forth

20. Type of Joints Gliding Joint
One part of a bone slides over another bone

21. Gliding Joints: Spine, Wrists, Ankles
Slide against each other in a gliding motion
Gives your wrists and ankles lots of freedom

22. Immoveable joints are located in the skull and pelvis.

25. Skeletal muscle is the type of muscle that primarily responsible for movement.

28. Cardiac muscle is found only in the heart and it’s adapted function is to generate and conduct electrical impulses necessary for its rhythmic contraction (it keeps the heart beating)

31. The most common function of smooth muscle is to squeeze, exerting pressure on the space inside the tube or organ it surrounds in order to move material through it.

33. How do muscles work

35. Inside a Muscle
Muscle Fiber
Muscle
Myofibril