Font size
WorksheetsUnit 11 Construction of bones
Total questions: 44
Worksheet time: 15mins
The strength of bone normally increases if stress on the bone ........
varies
decreases
increases
stops
The organic matrix is ......... by osteoblastic activity
deposited
repaired
digested
broken
bones of athletes may become heavier than those of non-athletes because .........
athletes always weigh more than non-athletes
athletes' bones remain thick and normal calcified
athletes' bones receive more stress
athlete's bones are naturally tougher
Osteoclasts are found in the ......... of bone
outer layers
hollow spaces
calcium salts
collagen fibers
Decalcification is the result of .........
a bone fracture
secretion of the osteoblasts
osteoclastic activity
weakening of the bone
The osteocyte depends on the ......... to carry out its task
osteoblasts
blood
calcium salts
osteon
The total amount of bone usually .........
varies little
increases as bone ages
varies greatly from year to year
lessens as stress increases
Dissolving and absorbing bits of bone which are no longer important to the efficient design of the skeleton is the task of .........
osteoclasts
osteoblasts
osteocytes
osteon
Osteoclasts can form from ......... , ......... , or even from ......... in the bone marrow
osteocytes, osteoblasts, fibroblasts
osteocytes, osteons, osteoblasts
osteocytes, fibroblasts, osteons
osteocytes, osteoblast, osteons
Osteoclasts actually eat ......... in large areas of the bones
holes
osteons
parts
callus
Bone ordinarily adjusts its strength in proportion to the degree of bone .........
stress
marrow
mass
osteon
Continual physical stress stimulates ......... deposition of bone
osteoblastic
osteoclastic
osteocytic
fibroclastic
The normal toughness of bone is generally maintained by the constant formation of new bone .........
matrix
osteoclast
osteoblast
marrow
When bone ages, it becomes relatively weak and brittle as the old matrix begins to .........
degenerate
increase
decrease
generate
The new bone is laid down in ......... on the inner surface of the cavities until the hole is filled up
successive layers
relative leaves
successive leaves
relative layers
Toughness of bone is maintained by the replacement of old material with new
True
False
Osteoclasts destroy bone that is vital to the body
True
False
Bones grow stronger if they are under constant stress
True
False
New bone is deposited in layers, one on top of another
True
False
A bone which is not used will become thin and decalcified
True
False
Osteocytes demolish new bone as it is being formed
True
False
Bone tends to be more brittle in old than in young people
True
False
Bone is deposited in proportion to a person's height
True
False
The strength of bone normally stays about the same because of the continual deposition of new bone matrix
True
False
Deposition and absorption proceed at a faster pace in children's bones than in adults'
True
False
The organic matrix and the bone salts are absorbed .........
when the callus is formed
at the same time
when the bone is subjected to heavy loads
until the hole is filled up
Osteoclasts give off acids which help in the calcification of bone
True
False
When the callus is no longer useful, it is dissolved by the osteoclasts
True
False
During osteoclastic activity, there is no deposition of new bone matrix
True
False
Osteoblasts are found in most .......... of the bones and in many .........
surfaces / cavities
osteons/ marrow
osteocytes/ osteoblasts
salts/ capillaries
The matrix possesses special property, which cause ........ precipitation
calcium phosphate
phosphate calcium
bone salts
deposition
The osteoclasts have the task of ....... and absorbing bits of bone that are no longer important to the efficient design of the skeleton
dissolving
dissolution
precipitating
precipitation
bone absorption results from osteoclastic ........ that digest or dissolve the organic matrix and cause the dissolution of the bone salts
secretion of acids
production of calcium
secretion of calcium
production of acids
The osteocytes maintain the bone around it using repair materials it gets from the blood flowing through nearby ........
capillaries
veins
marrow
collagens
osteoblasts secrete an organic material to form the collagen ....... and make up the organic .... of the bone
fibers / matrix
matrix / fibers
calcium / phosphate
phosphate / calcium
the rate of deposition and absorption are .............. to each other so that the total mass of bone remains constant.
equal
same
similar
different
At the end of this time the osteoclasts are connected to ......... and new bone begins to develop
osteoblasts
osteocytes
osteons
calcium
The osteocyte is a former osteoblast that has been ........ in a tiny space within the bone
put
trapped
got
pushed
The continual deposition and absorption of bone has a number of ........ important functions
physiologically
physiological
biologically
biological
Bones .......... when subjected to heavy loads
thicken
thinnen
weaken
worsen
Continual physical stress stimulates ....... deposition of bone.
osteoblastic
osteoblasts
osteoclastic
osteoclasts
When a bone is fractured, for the osteoblasts in the area are ..........
activated
destroyed
restored
stored
After the callus has served its purpose, ........ slowly shave it away
osteoblasts
osteoclasts
osteocytes
osteons
When bone ages, it become relatively weak and ..... as the old matrix begins to degenerate.
strong
brittle
hard
rubber
