Skeletal System

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10 Terms

1
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What is an osteocyte

Mature bone cells that maintain bone matrix

2
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What is teh osteoclast

Cells responsible for reabsorbing calcium from bone destruction

3
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What are osteons

Cylindrical structural unit of compact bone

4
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What is lamellae

Concentric rings of bone matrix

5
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What is lacunae

Small spaces between lamellae that house osteocytes

6
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What is canaliculi

Channels connecting lacunae allowing osteocytes to exchange materials

7
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Which hormones increase plasma calcium levels

Calcitrol and Parathyroid hormone

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How do calcitrol and parathyroid hormone increase calcium levels?

By stimulating osteoclasts to break down bone which increases plasma Ca levels in the blood

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Which hormone decreases plasma calcium levels

Calcitonin

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How does calcitonin decrease plasma Ca levels

By inhibiting osteoclasts