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Musculoskeletal System
Allows for movement!
How muscles and bones allow
movement
Vocab
• Antagonistic pairs: muscles work in pairs with
opposite functions
– Flexion (contraction)
– Extension (relaxation)
Terms
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Muscle: contractile tissue
Tendon: attaches muscle to bone
Ligaments: hold bones together
Joint: place where bones come together
Cartilage: protects bones at joints
3 Types of Muscle Cells
How does a muscle know when to
move?
• Neuromuscular junction—acetylcholine
neurons release neurotransmitters to signal
muscle contraction
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!
Identify the role of ATP and
Calcium ions in control
Rigor Mortis
Bones
• Skeletal System
– Protects organs
– Allows for movement
– Produces blood cells
– Bone Marrow
Bones and Calcium
Osteoporosis
• Osteoblasts
– Build Bone
• Osteoclasts
– Release Calcium
*Building bone process stops
when you age
*Why would it be important for
older adults to take
supplements of calcium?
Activity
• We will dissect a chicken wing to model the
role of the musculoskeletal system!