chapter 6 quiz
osteons
functional unit of compact bone
lacunae
gaps in bone matrix which contain osteocytes
The skeleton does all of the following EXCEPT:
initiate movement
Osteoporosis
is a condition in which bone deposition exceeds bone resorption.
All of the following are true of exercise and bone EXCEPT:
Adolescents should avoid weight-bearing exercises to prevent bone loss in their later years
Which of the following is true of bone scans?
Bone scans are the standard medical imaging technique for measuring bone density
Which of the following is true of bony callus formation?
Fibrocartilage is converted to spongy bone by osteoblasts
Which of the following is true of bone remodeling?
It requires the activity of both osteoblasts and osteoclasts
All of the following issues are found in bone EXCEPT:
Muscle Tissue
what is the relationship of nerves and bones?
Nerves follow the blood vessels that supply the bones.
What is the relationship between the skeletal system and the blood ?
Some bones house hemopoietic tissue that make blood cells
Which of the following is true of bone histology?
The connective tissue matrix of bone is only about 50% crystallized mineral salts
Compared to intramembranous ossification, endochondral ossification
allows both interstitial and appositional growth.
How does PTH elevate blood Ca2+ levels?
by increasing the number and activity of osteoblasts
Which blood vessels are associated with a hole in the shaft of a long bone?
diaphyseal arteries and veins
Which event must occur first in appositional growth of bone?
differentiation of periosteal cells into osteoblasts
Which of the following is the membrane that lines the medullary cavity of a long bone?
endosteum
Spongy bone
houses red bone marrow
All of the following are associated with compact bone EXCEPT:
trabeculae
When the bone matrix forms during intramembranous ossification,
trabeculae develop and fuse to form spongy bone.
The epiphyseal plate
consists of 4 zones of Chondrocytes
osteoprogenitor cells
derived from embryonic cells that persist in periosteum; become osteoblasts
osteoclasts
derived from white blood cells called monocytes; secrete enzymes that resorb bone
Place the events of intramembranous ossification in the order in which they occur.
development of the ossification center, calcification, formation of trabeculae, development of periosteum.
The alignment of osteons in compact bone
is along lines of physical stress on a long bone
Compact bone
is arranged in units called osteons (Haverstian system)
The zone of hypertrophic cartilage
is filled with large chondrocytes that are accumulating glycogen
Which of the following cells would be expected to be most active in replacing bone matrix lost due to an injury?
osteoblasts
Which of the following hormones is most important in regulating the movement of Ca2+ between the blood and bones?
parathyroid hormone
periosteum
protects bone; assists in fracture repair; essential for appositional growth
The pediatrician tells the parents that their child has a greenstick fracture. IN Laymen's terms, what is a greenstick fracture?
A partial break that results in one side of the broken bone bending
osteocytes
arise from cells that trap themselves in the calcified matrix they secrete; maintain daily metabolism of bone
Which structures allow communication between blood vessels and nerves in the periosteum and endosteum?
central (Haversian) canals
canaliculi
channels in bone matrix; allow osteocytes to communicate with each other
articular cartilage
reduces friction and absorbs shock at joints that have a wide range of motion
Bone formation
requires replacement of pre-existing connective tissue.
diaphysis
shaft of a long bone