Skeletal System Flashcards Preview

Module 2 > Skeletal System > Flashcards

Flashcards in Skeletal System Deck (19):
1

Functions Skeletal system

Structural support
Storage of Ca2+ and PO42-
Blood cell production in red marrow protection of soft tissue organs
Leverage that allows for delicate powerful movements

2

Shapes

Flat bone
Long bone
Short bone
Irregular bone
Sesamoid bone
Sutural bone

3

Long Bone components

Proximal Epiphysis
Diaphysis
Distal Epiphysis

4

Bone

2/3 Calcium phosphate
1/3 Collagen
2% bone cells

5

Bone cells

1) Osteocytes
2) Osteoblasts
3) Osteoclasts

6

Osteocytes

Mature bone cells ( recycle Ca2+ salts, repair bone)

7

Osteoblasts

Responsible for osteogenesis/promote deposition of Ca2+ salts

8

Periosteum

Lining of the bone

9

2 types of bone in all bones

Compact bone
Spongy bone

10

Osteoclasts

Secrete acids, enzymes, and enzymes to dissolve bony matrix
Released stored materials

11

Osteogenesis imperfecta

Brittle bone disease

12

Bone Growth + Formation

*Begins at 6 weeks of fetal development
*Continues through adolescence (but begins to end at puberty)
* Cartilage models process ossification (bone formation)
*Two types of ossification
1) Intramembraneous ossification
2) Endochrondral ossification

13

Intramembraneous ossification

Differentiation and conversion to bone during embryonic and fetal development
Ex. Skull, Mandible, Clavicles

14

Endochrondral ossification

1) Cartilage - mini bone models during fetal development
2) Calcification occurs around cartilage /Chondrocytes die
*calcium phosphate deposits
3) Bone forma around outside
4) Blood vessels invade and provide nutrients
5) Bone enlarges - moves toward ends
6) Inner marrow cavity forms

15

Chondrocytes

Cartilage cells

16

At puberty

* Increased GNRH > Increased FSH/LH > Increased estrogen/ testosterone
* increased rate of bone formation relative to cartilage
* Closure of epiphyseal plate

17

Fracture

Any injury that disrupts the structural integrity of bone

18

Repair

1) Fracture hematoma forms
2) external and internal callus
3) External callus replaced with spongy bone
4) Remodling

19

Skeletal System

Bones, Cartilage, joints, ligaments