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5 bone biology > Bone structure and calcium homeostasis > Flashcards

Bone structure and calcium homeostasis Flashcards

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1
Q

what are the three functions of bone

A

skeletal
container for marrow
Ca2+ pool

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2
Q

what bone is above and which is below the line

A

above = alveolar
below = basal

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3
Q

what is the orange bone (arrow)
what is the beige bone (circle)

A
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4
Q

what will the thickness of cortical bone determine in dentistry

A

how easily LA can infliltrate

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5
Q

what technique is this

A

intraligamentary %

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6
Q
A

circumferential lamellae

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7
Q
A

concentric lamellae

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8
Q
A

interstitial lamellae

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9
Q

what is thet are the two processes through which bone can be formed

A

endochondral and intramembranous

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10
Q

explain the. process of endochondral ossification

A

cartilage to calcified cartilage to bone

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11
Q

explain the. process of intramembranous ossification

A
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12
Q

what are the 3 cells of the bone

A

osteoblasts
osteocytes
osteoclasts

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13
Q

where are osteoblasts dervived from

A

mesenchymal or ectomesenchymal origin

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14
Q

what are osteocytes

A

trapped osteoblasts

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15
Q

where are osteoclasts dervived from

A

haemopoietic source

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16
Q

what are the properties of osteoclasts

A

large multinucleated cells

17
Q

how often is bone completely replaced

A

every 10 years

18
Q

how is calcium regulated

A
19
Q

what hormone prevents hypocalcaemia

A

parathyroid hormone

20
Q

when is parathyroid hormone released

A

when calcium falls

21
Q

what is the result of the release of parathyroid hormone

A

increase of calcium into the plasma

22
Q

how does the release of parathyroid hormone increase the levels of calcium in the plasma

A

withdraws calcium from the bone bank

23
Q

what is the function of calcitonin

A

prevents calcium in the plasma from becoming too high

24
Q

what is vitamin D essential for

A

calcium absorption in the intestine

25
Q

what is vitamin D produced from

A

in the skin in response to sunlight

5 bone biology (3 decks)

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