1. Musculoskeletal System
Allows for movement!

2. How muscles and bones allow movement

3. Vocab
Antagonistic pairs: muscles work in pairs with opposite functions
Flexion (contraction)
Extension (relaxation)

4. Terms Muscle: contractile tissue Tendon: attaches muscle to bone
Ligaments: hold bones together
Joint: place where bones come together
Cartilage: protects bones at joints

5. 3 Types of Muscle Cells

6. How does a muscle know when to move?
Neuromuscular junction—acetylcholine neurons release neurotransmitters to signal muscle contraction

7. How do muscles move? Sliding filament theory:
Myosin (thick filament) pulls on Actin (thin filament) causing each sarcomere (muscle unit) to contract
Lots of ATP is needed for this to happen!

8. Identify the role of ATP and Calcium ions in control

9. Rigor Mortis

10. Bones Skeletal System Protects organs Allows for movement
Produces blood cells
Bone Marrow

11. Bones and Calcium

12. Osteoporosis Osteoblasts Osteoclasts Build Bone Release Calcium
*Building bone process stops when you age
*Why would it be important for older adults to take supplements of calcium?

13. Activity
We will dissect a chicken wing to model the role of the musculoskeletal system!