Mer Scott
Quiz by , created more than 1 year ago

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.

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Mer Scott
Created by Mer Scott about 7 years ago
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L7 Cellular Activity of Bone Tissue

Question 1 of 14

1

It takes about 6 weeks for the fibrocartilage in a fetus to begin developing into bones(ossification.)

Select one of the following:

  • True
  • False

Explanation

Question 2 of 14

1

The of long bones is the centre of ossification. The occur in the . These are separated by the epiphyseal plate, which is initially cartilaginous but becomes bone later in life.

Drag and drop to complete the text.

    diaphysis
    primary
    secondary centres
    epiphysis

Explanation

Question 3 of 14

1

The process of bone growing in width is called moulding.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 14

1

During moulding:
(Choose ALL CORRECT statements.)

Select one or more of the following:

  • Osteoblasts in the periosteum increase bone width.

  • Osteoclasts form the medullary cavity.

  • Osteoblasts in the medullary cavity form the trabeculae.

  • Osteoclasts increase the width of the periosteum.

Explanation

Question 5 of 14

1

In 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.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 14

1

Red marrow is red as it is highly vascularised.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 14

1

What is epiphyseal fusion?

Select one of the following:

  • The calcification of the region between an epiphysis and edge of the medullary cavity.

  • The ossification of the epiphyseal joint.

  • The ossification of the epiphyseal plate.

  • The merging of two regions of bone between the epiphysis and diaphysis.

Explanation

Question 8 of 14

1

Bone pathology:

Select one of the following:

  • Is an imbalance of osteoclastic and osteoblastic activity.

  • Is the structure of bones at the cellular level.

Explanation

Question 9 of 14

1

Osteoporosis is the weakening of the bone due to porousness, caused by osteoblastic activity overtaking osteoclastic activity.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 14

1

Weakening of cancellous bone commonly leads to compression fractures.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 14

1

Which of these is not a cause or contributing factor to risk of osteoporosis?

Select one of the following:

  • Menopause (decrease in estrogen)

  • Lack of exercise

  • Eating disorders

  • Early use of steroids

  • Excess calcium intake

Explanation

Question 12 of 14

1

Select from the dropdown lists to complete the text.

Assign these stages of a fracture with a time frame:
A hematoma forms, capillaries growing into it and phagocytes cleaning up debris, ( almost immediately, after 24 hours ).
Chondroblasts form a soft procallus of cartilage, ( within 3 days, within 3 weeks ).
Osteoblasts ossify the callus into a bony callus, ( by 6 weeks., by 6 months )
Normal activity remodels the bone in the following weeks, or potentially ( years, months ) until the callus has disappeared (generally in adults.)

Explanation

Question 13 of 14

1

Not fixing a fracture results in pseudoarthrosis.

Select one of the following:

  • True
  • False

Explanation

Question 14 of 14

1

Which fracture has the most potential risk?

Select one of the following:

  • Compound fracture

  • Open fracture

  • Greenstick fracture

Explanation

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