Bones Flashcards
The connective tissue of bone is ___ and _____
vascular, innervated
What is the mineralized component of bone that gives its hardness and rigidity?
hydroxyapatite
What is the organic component of bone that gives it flexibility?
osteiod
Osteoid contains ___ fibers
collagen
The osteoid contains what part of the extracellular matrix?
ground substance
What type of tissue is bone?
connective
What are the 3 types of bone cells?
osteoblasts, osteocytes, osteoclasts
Where are osteoblasts found?
near periosteum and endosteum
What is the function of osteoblasts?
produce bone matrix
What is the function of osteocytes?
maintain bone
Where are ostecytes found?
in lacunae
Were are osteocytes found?
in lacunae
What is the main function of osteoclasts?
destroy bone tissue
If the body needs to tap into the bone’s calcium of phosphorus stores, _____ breaks down the bone to release the minerals into the bloodstream
osteoclasts
What are the 5 main functions of bone?
support and protect soft tissue, movement, energy metabolism, mineral storage, and blood cell formation
How do bones help regulate blood sugar and fat storage?
through hormone secretion
Where does blood cell formation occur in bones?
bone marrow
What is another term for blood cell formation?
hematopoiesis
What are the four shapes of bone?
long, short, flat, and irregular
What type of bones are longer than they are wide?
long
What type of bones are cube shaped?
short
What type of bones are flat and thin?
flat
Bones of the hands and feet are examples of what type of bone?
long
carpals and tarsals are examples of what type of bone?
short
vertebrae, os coxae, and facial bones are what type of bone?
irregular
neurological bones, ribs, scapula, and sternum are what type of bones?
flat
Where are sesamoid bones found?
within muscle tendons
patella is what type of bone?
sesamoid
What is the function of sesamoid bones?
sit within the tendon and redirect muscle force
What is the shaft of the long bone called?
diaphysis
The diaphysis is what part of the long bone?
long shaft
What are the ends of the long bone called?
epiphysis
What part of the long bone is the epiphysis?
ends
What is the name of the connective tissue covering the outside of the bone?
periosteum
What is the periosteum?
the connective tissue covering the outside of the bone
What is the name of the connective tissue lining the inside of the bone (medullary cavity and central canals of osteons)?
endosteum
What is the endosteum?
the connective tissue lining the inside of the bone
What is the medullary cavity of the long bone?
the open space within the shaft
What is the open space within the shaft called?
medullary cavity
What is the epiphyseal line?
remnents of the growth plate
What is the epiphyseal line?
remnants of the growth plate
What is the space of remnants of growth plates called?
epiphyseal line
What is the structure of short, irregular, and flat bones?
a layer of spongy bones covered by an outer layer of compact bone
Short, irregular, and flat bones do not have a _____ cavity
medullary
Compact bone is also known as _____
cortical bone
Cortical bone is also known as ____
compact bone
Compact bone is ____ with ____
solid, canals
What are 2 other names for spongy bones?
trabecular or cancellous
Spongy bone is located where on long bones?
at the ends
Spongy bone is ____ with spaces
lattice
What are the rings on bone tissue called?
lamella
What does blood travel through in bones?
Haversian/central canal
What are the spaces between lamella called?
lacunae
What are the projections off lacunae called that allow for the communication between osteocytes?
canaliculi
What is the horizontal connection that allows blood vessels and nerves to travel between osteons?
Volkmann’s canal
Spongy bone does not have what type of cells?
osteons
Why does spongy bone have lamelle without canals?
they already have open spaces in the lattice
Why does spongy bone have lamella not in a canal?
there is already open spaces in the lattice
Trabeculae of the spongy bone follows the lines of ____ and _____
tension, compression
What are the two types of bone growth?
interstitial and appositional
Interstitial growth is growth in _____
length
When does interstitial growth occur?
childhood and adolescence
Where does interstitial growth occur?
growth plate made of cartilage
What is the sign that interstitial growth can cease?
epiphysis and diaphysis meet and growth plates ossify
Appositional growth is growth in ____
thickness
In appositional growth, _____ destroys old bone and _____ creates new bone
osteoclasts, osteoblasts
In appositional growth, osteoclasts also remove bone in the _____
medullary cavity
Compact bone is replaced every how many years?
10
Spongy bone is replaced every how many years?
3-4
Osteoclasts breaking down bone tissue is known as ____
bone resorption
Osteoblasts laying down new bone is known as ____
bone depostion
Osteoblasts laying down new bone is known as ____
bone deposition
Remodeling of bone is in response to what?
mechanical stress
Bone remodeling is done to ______
maintain total bone mass