Side ASide B
Which of following is a function of the skeletal system?
blood cell production
protection of internal...
When a fractured bone heals it leaves a thickened region known as a ____________.
This cell (osteoclast) functions to _________.
lay down matrix fibers
Spongy bone is filled with ____________.
A vertebra is an example of a(n) __________ bone.
In relationship to the diaphysis of a long bone, the osteons are
A drop in blood calcium levels stimulates the secretion of __________.
A bone scan of an older patient revealed the beginnings of osteoporosis. Which of these interventions...
vitamin D supplements
Migration of osteoblasts into the ___________ creates the __________.
epiphysis, secondary ossification center
Where in the body does the production of precursors for the synthesis of calcitriol occur?
Which of these forms by intramembranous bone formation?
Which of these is a primary role of the skeletal system?
Which of the following are
Which of the following characteristics applies to the cells known as
They are stem cells.
They are mature bone cells.
Osteoblasts differentiate from __________.
Bone is composed of ________ percent cells.
Through the action of osteoclasts,
osteoid is calcified.
new bone is formed.
________ account(s) for almost two-thirds of the weight of bone.
________ cells are located in the inner cellular layer of the periosteum.
The most abundant cell type in bone is
The type of bone that forms the diaphysis of a long bone is called __________ bone.
The interconnecting tiny arches of bone tissue found in spongy bone are called
Fat is stored within the
The trabeculae of spongy bone
are composed mostly of cartilage
.will collapse under stress.
are organized along stress lines.
Migration of blood vessels into the central region of the cartilage bone model, starting bone...
secondary ossification center
The cell (osteoblasts) designated by the arrow _________.
differentiates into osteoblasts
During endochondral bone formation, the primary ossification center is located in the __________.
Intramembranous ossification begins with differentiation of ________ cells.
When the epiphyseal plate is replaced by bone,
interstitial bone growth begins.
appositional bone growth...
Accelerated closure of the epiphyseal plates could be caused by
too little thyroxine.
elevated levels of estrogen.
When production of sex hormones increases at puberty, epiphyseal plates
In normal adult bones,
osteoclasts continue to be active long after osteoblast activity ceases.
Calcitriol is required for __________.
A lack of exercise could
result in porous and weak bones.
Excessive growth hormone prior to puberty could result in
Which hormone increases blood calcium upon secretion?
parathyroid hormone (PTH)
Bone plays a central role in the regulation of blood levels of
Which of the following is formed immediately after a fracture?
What is normally found at a fracture hematoma?
Why does osteoporosis affect more women than men?
Men exercise more than women and therefore have less osteoporosis.
Aging has what effect on the skeletal system?
fusion of joints, especially syndesmoses