Chapter 3: Functions and components of the skeletal system Flashcards
functions of the skeletal system (1)
movement
trade off - strength and range of motion
functions of the skeletal system (2)
structure/support
designed to bear our weight standing up
designed for movement
designed for standing
functions of the skeletal system (3)
protection
protects most important organs (heart, brain, lungs)
functions of the skeletal system (4)
blood production:
- red blood cells (bone marrow) is made in bones
- adolescents make more
- axial and appendicular in kids
- just axial in adults
functions of the skeletal system (5)
storing calcium
- every muscle contraction requires calcium
- you are always using calcium
- no calcium ——-> dead
- can reshape bones
components of the skeletal system (1)
Bones
components of the skeletal system (2)
Cartilage
- hyalin - ends of bones in joints (friction)
- fibrocardilage - intervertibral discs - pubic bones (shock absorption)
- elastic - outer ear (shape)
components of the skeletal system (3)
tendons - muscle to bone
ligaments - bone to bone
Types of cartilage (1)
chondroblasts
-builds cartilage - matrix around cell - collagen fibers
-proteiglycens (water)
cartilage
non-inerverated (no nerves)
avascular - no blood vessels
Types of cartilage (2)
chondrocyte
- cartilage cell
- when the chondroblast is completely surrounded by by matrix
Lacunae - cacoon for CB
Types of cartilage (3)
Perichondrium
- connective tissue membrane around the cartilage
- inside layer of membrane
- inside has CB
- outside layer has blood vessels
Types of cartilage (4)
Articular cartilage
covers bone at joint
Types of cartilage (5)
Appositional growth
New chondrocytes and new matrix at the periphery
Types of cartilage (6)
Interstitial growth
(between)
Chondrocytes within the tissue
divide and add more matrix
between the cells
Between what ages are blasts and clasts the same?
30-50
what is bone always doing?
being taken apart and put together
In whom are blasts the most active?
children
Bone histology - matrix
Collagen fibers for strength - if collagen is gonna bones become brittle
hydroxapitate
minerals gone - bone is bendy
Osteoblasts
Builds bone
ossification - formation of bone
osteocytes
maintainer
lacunae
room that contains osteocytes and chondrocytes
canaliculi
a canal that connects osteocytes to blood supply
osteoclasts
Bone cutters - takes apart bones
Spongy bone
Found in ends of long bones
makes bones lighter
trabeculae
interconnecting rods or plates of bone
- spaces filled with marrow
- covered with endosteum
- oriented along stress lines
Compact bone
- thickest in shaft
- all around bones
Haversian canals
central goes the length of the bone
- has blood
- cells are arranged around canal