1. Muscular and Skeletal Systems
Finz 2014

2. Skeletal System
Function: 1. Support of the body 2. Protection of internal organs 3. Provides movement 4. Stores minerals 5. Site of blood cell formation

3. Structure: Axial skeleton: skull, vertebral column and ribs
Structure: Axial skeleton: skull, vertebral column and ribs. Appendicular skeleton: pectoral/pelvic girdles and appendages (arms & legs Periosteum: Connective tissue layer on outside of bone. Outer Layer: "Compact bone" contains blood vessels that run through Haversian canals Core: "Spongy bone" provides strength.206 bones: red marrow (where blood is made) yellow marrow (fat cells) Cartilage: strong & flexible cushion between bones for protection.

5. Axial Skeleton (Green)

6. Appendicular Skeleton(Yellow)

7. Ligaments: Connects bone to bone.
Tendons: Connects bone to muscle.
Synovial fluid: Lubricates joints.

8. Joints: Where two bones meet.

11. Muscular System:
Function: movement and protection of some internal organs. Skeletal muscles: Attached to bones for movement (Tendons) Have many nuclei Striated

13. Smooth muscles:
Found in involuntary organs Aid in digestion & reproduction Contraction is called peristalsis One nucleus No striations

15. Cardiac muscle
Is your heart One or two nuclei Involuntary Striated

17. How Muscle & Bones Interact
ONLY skeletal muscles attach to bones.
Attached with tendons.
When a muscle contracts, it shortens.
When a muscle relaxes, it lengthens.
One muscle is attached to TWO bones.
When the muscle contracts, it pulls the bones closer together