1. The Basics:
Bones and
Muscles

2. Bones
 The bones in your body have 3 main jobs:
 1. protection
 2. muscle attachment
 3. support
 Each of your bones may have more than
1 job

3. Bone Functions
 The following 5 slides highlight several
important bones in your bodies.
 Find each bone/s.
 Think about where the bone/s are located in
your body
 Try to determine what the function of each
bone/s is (protection, muscle attachment
and/or support)

4. Vertebrae
1. Find the vertebrae
2. Hypothesize what the
job/s of the vertebrae
are

5. Skull (Cranium)
1. Find the skull (cranium)
2. Hypothesize what the
job/s of the cranium are

6. Leg Bones
(femur, tibia and fibulla)
1. Find the leg bones
2. Hypothesize what the
job/s of the leg bones
are

7. Pelvis
1. Find the pelvis
2. Hypothesize what the
job/s of the pelvis are

8. Phalanges
1. Find the phalanges
2. Hypothesize what the
job/s of the phalanges
are

9. How did you do?
Protection Support Muscle
Attachment
• Vertebrae • Vertebrae • Vertebrae
• Cranium • Leg Bones • Cranium
• Pelvis • Pelvis • Leg Bones
• Pelvis
• Phalanges

10. Skeletal Muscles
 The main job of
skeletal muscles
is to pull bones
 When a skeletal
muscle
contracts, a
bone is pulled

11. Skeletal Muscle Fibers
 Skeletalmuscles are
composed of
skeletal muscle
fibers
 When these fibers
contract, the
muscle shortens

12. Skeletal Muscle Cells Cell
 Cells are very
organized
 Unlike most cells,
skeletal muscle cells
contain many nuclei
 Why do you think
skeletal muscle cells
have so many
nuclei?
Nucleus