Who am I

1
?? Who am I ??

• Im trapped!
• But Im still alive!

2
?? Who am I ??

• They call me Packman for short.
• My favorite food is Calcium-salts

3
?? Who am I ??

• I make something hard and strong that allows bone
  to be the steel girders and reinforced
  concrete of the body.
• I am free and not trapped in a small protected
  world.

4
Bag of Bones

• Why are bones considered organs?

5
Just try and classify me!

• The humerus, femur, phalanges, tibia, fibula,
  radius, ulna.

6
Just try and classify me!

• When you clap, youre pounding on me.

7
Just try and classify me!

• Me, along with others like me, protect the
  Master Mind.

8
Just try and classify me!

• I protect what runs through me.
• Because of my shape, I allow you to bend and
  stretch.

9
Bone tired!

• Who am I and what do I do?
• I look like a sponge, and contain little beams.

10
Bone tired!

• Who am I and what do I do?
• Im smooth, dense, and thick.

11
Dry as a bone!

• Why would you expect the arm bones of a weight
  lifter to be thicker and heavier than those of a
  runner?

12
No Bones about it!

• Arrange the following steps of intramembranous
  osteogenesis in the correct order
• 1. Surrounding mesenchyme become Periosteum.
• 2. Osteoblasts secrete collagen and then enzymes
  for Ca-salts deposit in the extracellular matrix
• 3. Increased vascularization
• 4. Osteoblasts are trapped in lacunae - now
  called osteocytes.
• 6. Some mesenchymal cells (stem cells) become
  osteoblasts

13
Arrange the following steps of endochondrial
osteogenesis in the correct order

• 1. Osteoclasts eat away bone matrix --
  medullary cavity, and help shape the bone
• 2. The connective tissue surrounding cartilage
  is infiltrated with blood vessels.
• 3. Osteoblasts deposit bone matrix around the
  cartilage - Bone collar.
• 4. Cartilage dies.
• 5. Mesenchymal cells (Stem cells) become
  chondrocytes - cartilage
• 6. Connective tissue that was once surrounding
  cartilage now surrounds bone, it is now called
  periosteum.
• 7. Some of the cells of the connective tissue
  surrounding the cartilage, specialize into
  osteoblasts.

14
No Bones about it!

• A child who enters puberty several years later
  than the average age is generally taller than
  average as an adult. Why?

15
Did ya know????

• The epiphyses of the femur is fully replaced
  every 5-6 months, the diaphysis is altered more
  slowly.

16
Did ya know????

• Every week we recycle 5-7 of our bone mass (as
  much as 1/2g may enter or leave the skeleton per
  day).

17
What would happen

• to the developing fetus if Mom wasnt taking in
  enough calcium or vit. D?

18
What would happen

• if osteoblast action did not osteoclast action?

19
What would happen

• if blood flow to the fetus was low? Or, Mom is
  anemic?