Quiz
L7 Cellular Activity of Bone Tissue
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Questions in this quiz (14)
1It takes about 6 weeks for the fibrocartilage in a fetus to begin developing into bones(ossification.)
- ATrue
- BFalse
2The [blank_start]diaphysis[blank_end] of long bones is the [blank_start]primary[blank_end] centre of ossification. The [blank_start]secondary centres[blank_end] occur in the [blank_start]epiphysis[blank_end]. These are separated by the epiphyseal plate, which is initially cartilaginous but becomes bone later in life.
- Adiaphysis
- Bprimary
- Csecondary centres
- Depiphysis
3The process of bone growing in width is called moulding.
- ATrue
- BFalse
4During moulding:
(Choose ALL CORRECT statements.)- AOsteoblasts in the periosteum increase bone width.
- BOsteoclasts form the medullary cavity.
- COsteoblasts in the medullary cavity form the trabeculae.
- DOsteoclasts increase the width of the periosteum.
5In children, the medullary cavity is full of yellow marrow to facilitate the continuous growth, while in adults the medullary cavity is filled with red marrow.
- ATrue
- BFalse
6Red marrow is red as it is highly vascularised.
- ATrue
- BFalse
7What is epiphyseal fusion?
- AThe calcification of the region between an epiphysis and edge of the medullary cavity.
- BThe ossification of the epiphyseal joint.
- CThe ossification of the epiphyseal plate.
- DThe merging of two regions of bone between the epiphysis and diaphysis.
8Bone pathology:
- AIs an imbalance of osteoclastic and osteoblastic activity.
- BIs the structure of bones at the cellular level.
9Osteoporosis is the weakening of the bone due to porousness, caused by osteoblastic activity overtaking osteoclastic activity.
- ATrue
- BFalse
10Weakening of cancellous bone commonly leads to compression fractures.
- ATrue
- BFalse
11Which of these is not a cause or contributing factor to risk of osteoporosis?
- AMenopause (decrease in estrogen)
- BLack of exercise
- CEating disorders
- DEarly use of steroids
- EExcess calcium intake
12Assign these stages of a fracture with a time frame:
A hematoma forms, capillaries growing into it and phagocytes cleaning up debris, [blank_start]immediately[blank_end].
Chondroblasts form a soft procallus of cartilage, [blank_start]within 3 days[blank_end].
Osteoblasts ossify the callus into a bony callus, [blank_start]by 6 weeks.[blank_end]
Normal activity remodels the bone in the following weeks, or potentially [blank_start]years[blank_end] until the callus has disappeared (generally in adults.)- Aalmost immediately
- Bafter 24 hours
- Cwithin 3 days
- Dwithin 3 weeks
- Eby 6 weeks.
- Fby 6 months
- Gyears
- Hmonths
13Not fixing a fracture results in pseudoarthrosis.
- ATrue
- BFalse
14Which fracture has the most potential risk?
- ACompound fracture
- BOpen fracture
- CGreenstick fracture
Information
- Description
- Objectives: • Describe the general principles of bone growth. • Describe the process of bone remodelling and explain how this relates to osteoporosis. • Describe the healing of bone fractures.
- Author
- Mer Scott
- Language
- English
- Views
- 40
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