Bone Remodelling Flashcards Preview

Anatomy > Bone Remodelling > Flashcards

Flashcards in Bone Remodelling Deck (15)
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1
Q

What is Wolf’s Law?

A

Bone will grow and remodel in response to forces and demands placed upon it. Thus, a bone will adapt to its needs

2
Q

What is the role of gravitational forces?

A

To support body weight

3
Q

What is a muscle pull?

A

A bony landmark formed from where muscles are attached

4
Q

What is the role of bone deposition and bone restoration?

A

To control bone remodelling

5
Q

At what rate is bone recycled?

A

5-7% per week

6
Q

How long does it take for a bone to be completely replaced?

A

~3-4 years for spongy, ~10 years for compact bone

7
Q

Child/adolescent

A

deposition > resorption

8
Q

Adult

A

deposition = resorption

9
Q

Elderly

A

deposition < resorption

10
Q

What is an osteoblast and what is its role?

A

Osteoblast is a bone forming cells and is responsible for bone deposition. The role includes repair following an injury and increasing bone strength

11
Q

What is an osteocyte and what is its role?

A

Osteoblast is a bone destroying cells and is responsible for bone resorption. The role includes destroying bone into minerals so they can be used by the body

12
Q

What happens when blood calcium levels are low?

A

When parathyroid glands detect low levels, it releases parathyroid hormone

13
Q

What is the role of the parathyroid hormone?

A

PTH stimulates osteoclasts to breakdown bone and releases it as calcium into the bloodstream

14
Q

What happens when blood calcium levels are high?

A

When the thyroid detects a high level, it releases calcitonin

15
Q

What is the role of calcitonin?

A

Calcitonin stimulates osteoblasts, removing calcium from the bloodstream and deposits as bone