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Unit 11 Construction of bones

Total questions: 44

Worksheet time: 15mins

Name
Class
Date
1.

The strength of bone normally increases if stress on the bone ........

a)

varies

b)

decreases

c)

increases

d)

stops

2.

The organic matrix is ......... by osteoblastic activity

a)

deposited

b)

repaired

c)

digested

d)

broken

3.

bones of athletes may become heavier than those of non-athletes because .........

a)

athletes always weigh more than non-athletes

b)

athletes' bones remain thick and normal calcified

c)

athletes' bones receive more stress

d)

athlete's bones are naturally tougher

4.

Osteoclasts are found in the ......... of bone

a)

outer layers

b)

hollow spaces

c)

calcium salts

d)

collagen fibers

5.

Decalcification is the result of .........

a)

a bone fracture

b)

secretion of the osteoblasts

c)

osteoclastic activity

d)

weakening of the bone

6.

The osteocyte depends on the ......... to carry out its task

a)

osteoblasts

b)

blood

c)

calcium salts

d)

osteon

7.

The total amount of bone usually .........

a)

varies little

b)

increases as bone ages

c)

varies greatly from year to year

d)

lessens as stress increases

8.

Dissolving and absorbing bits of bone which are no longer important to the efficient design of the skeleton is the task of .........

a)

osteoclasts

b)

osteoblasts

c)

osteocytes

d)

osteon

9.

Osteoclasts can form from ......... , ......... , or even from ......... in the bone marrow

a)

osteocytes, osteoblasts, fibroblasts

b)

osteocytes, osteons, osteoblasts

c)

osteocytes, fibroblasts, osteons

d)

osteocytes, osteoblast, osteons

10.

Osteoclasts actually eat ......... in large areas of the bones

a)

holes

b)

osteons

c)

parts

d)

callus

11.

Bone ordinarily adjusts its strength in proportion to the degree of bone .........

a)

stress

b)

marrow

c)

mass

d)

osteon

12.

Continual physical stress stimulates ......... deposition of bone

a)

osteoblastic

b)

osteoclastic

c)

osteocytic

d)

fibroclastic

13.

The normal toughness of bone is generally maintained by the constant formation of new bone .........

a)

matrix

b)

osteoclast

c)

osteoblast

d)

marrow

14.

When bone ages, it becomes relatively weak and brittle as the old matrix begins to .........

a)

degenerate

b)

increase

c)

decrease

d)

generate

15.

The new bone is laid down in ......... on the inner surface of the cavities until the hole is filled up

a)

successive layers

b)

relative leaves

c)

successive leaves

d)

relative layers

16.

Toughness of bone is maintained by the replacement of old material with new

a)

True

b)

False

17.

Osteoclasts destroy bone that is vital to the body

a)

True

b)

False

18.

Bones grow stronger if they are under constant stress

a)

True

b)

False

19.

New bone is deposited in layers, one on top of another

a)

True

b)

False

20.

A bone which is not used will become thin and decalcified

a)

True

b)

False

21.

Osteocytes demolish new bone as it is being formed

a)

True

b)

False

22.

Bone tends to be more brittle in old than in young people

a)

True

b)

False

23.

Bone is deposited in proportion to a person's height

a)

True

b)

False

24.

The strength of bone normally stays about the same because of the continual deposition of new bone matrix

a)

True

b)

False

25.

Deposition and absorption proceed at a faster pace in children's bones than in adults'

a)

True

b)

False

26.

The organic matrix and the bone salts are absorbed .........

a)

when the callus is formed

b)

at the same time

c)

when the bone is subjected to heavy loads

d)

until the hole is filled up

27.

Osteoclasts give off acids which help in the calcification of bone

a)

True

b)

False

28.

When the callus is no longer useful, it is dissolved by the osteoclasts

a)

True

b)

False

29.

During osteoclastic activity, there is no deposition of new bone matrix

a)

True

b)

False

30.

Osteoblasts are found in most .......... of the bones and in many .........

a)

surfaces / cavities

b)

osteons/ marrow

c)

osteocytes/ osteoblasts

d)

salts/ capillaries

31.

The matrix possesses special property, which cause ........ precipitation

a)

calcium phosphate

b)

phosphate calcium

c)

bone salts

d)

deposition

32.

The osteoclasts have the task of ....... and absorbing bits of bone that are no longer important to the efficient design of the skeleton

a)

dissolving

b)

dissolution

c)

precipitating

d)

precipitation

33.

bone absorption results from osteoclastic ........ that digest or dissolve the organic matrix and cause the dissolution of the bone salts

a)

secretion of acids

b)

production of calcium

c)

secretion of calcium

d)

production of acids

34.

The osteocytes maintain the bone around it using repair materials it gets from the blood flowing through nearby ........

a)

capillaries

b)

veins

c)

marrow

d)

collagens

35.

osteoblasts secrete an organic material to form the collagen ....... and make up the organic .... of the bone

a)

fibers / matrix

b)

matrix / fibers

c)

calcium / phosphate

d)

phosphate / calcium

36.

the rate of deposition and absorption are .............. to each other so that the total mass of bone remains constant.

a)

equal

b)

same

c)

similar

d)

different

37.

At the end of this time the osteoclasts are connected to ......... and new bone begins to develop

a)

osteoblasts

b)

osteocytes

c)

osteons

d)

calcium

38.

The osteocyte is a former osteoblast that has been ........ in a tiny space within the bone

a)

put

b)

trapped

c)

got

d)

pushed

39.

The continual deposition and absorption of bone has a number of ........ important functions

a)

physiologically

b)

physiological

c)

biologically

d)

biological

40.

Bones .......... when subjected to heavy loads

a)

thicken

b)

thinnen

c)

weaken

d)

worsen

41.

Continual physical stress stimulates ....... deposition of bone.

a)

osteoblastic

b)

osteoblasts

c)

osteoclastic

d)

osteoclasts

42.

When a bone is fractured, for the osteoblasts in the area are ..........

a)

activated

b)

destroyed

c)

restored

d)

stored

43.

After the callus has served its purpose, ........ slowly shave it away

a)

osteoblasts

b)

osteoclasts

c)

osteocytes

d)

osteons

44.

When bone ages, it become relatively weak and ..... as the old matrix begins to degenerate.

a)

strong

b)

brittle

c)

hard

d)

rubber