Skeletal System: Function and Components of Bone Flashcards Preview

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Flashcards in Skeletal System: Function and Components of Bone Deck (18):
1

What are 5 functions of the SKELETAL system?

1) Movement e.g. MUSCLES pull on BONES
2) Protection e.g. ribcage protects heart and lungs
3) Support e.g. VERTEBRAE, PELVIS (reproductive organs)
4) Mineral storage e.g. calcium
5) Blood cell formation e.g. in BONE MARROW

2

What % of BONE is made up of HYDROXYAPATITE CRYSTALS?

65%

3

What % of BONE is made up of OSTEOID?

33%

4

What % of BONE is made up of cells?

2%

5

What is the S & F of HYDROXYAPATITE CRYSTALS?

S - Made of calcium salts
F - Make up majority of BONE, crystals alone are hard but brittle

6

What is the S & F of OSTEOID?

S - Protein-carbohydrate complexes and collagen fibers
F - Collagen alone is flexible but can't support weight

7

What is the F of CELLS?

F - Build and remove BONE MATRIX

8

CRYSTALS formed around COLLAGEN are...

...a hard, flexible substance that is harder than steel for its weight

9

What is the F of OSTEOGENIC CELLS?

They divide to form OSTEOBLASTS

10

What is the F of OSTEOBLASTS?

They build BONE MATRIX

11

What is the F of OSTEOCLASTS?

They remove BONE MATRIX

12

What is the F of OSTEOCYTES?

They maintain BONE MATRIX (found in LACUNAE)

13

Which population of CELLS is busiest in young people (<30 years)?

OSTEOBLASTS

14

Which population of CELLS takes over as people age?

OSTEOCLASTS (can result in OSTEOPOROSIS)

15

When astronauts are in space, what type of CELLS increase in number and what does this result in?

Increase in OSTEOCLASTS = less BONE MASS

16

When the elderly are weight training, what type of CELLS increase in number and what does this result in?

Increase in OSTEOBLASTS = build bones

17

When backpacking in Europe, what type of CELLS increase in number and what does this result in?

Increase in OSTEOBLASTS = strong, dense BONES

18

When someone's leg is in a cast, what type of CELLS increase in number and what does this result in?

Increase in OSTEOCLASTS = lose BONE MASS