Muscular and Skeletal
Systems
Finz 2014
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
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.
Axial
Skeleton
(Green)
Appendicular
Skeleton(Yellow
)
• Ligaments: Connects bone to bone.
• Tendons: Connects bone to muscle.
• Synovial fluid: Lubricates joints.
Joints: Where two bones meet.
Muscular System:
Function: movement and protection of
some internal organs.
Skeletal muscles: Attached to bones for
movement (Tendons)
Have many nuclei
Striated
Smooth muscles:
Found in involuntary organs
Aid in digestion & reproduction
Contraction is called peristalsis
One nucleus
No striations
Cardiac muscle
Is your heart
One or two nuclei
Involuntary
Striated
How Muscle & Bones Interact
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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